diff --git a/documentation/pestpp4.3.19.docx b/documentation/pestpp4.3.20.docx
similarity index 52%
rename from documentation/pestpp4.3.19.docx
rename to documentation/pestpp4.3.20.docx
index 6e749ecfa..dc9edd91c 100644
Binary files a/documentation/pestpp4.3.19.docx and b/documentation/pestpp4.3.20.docx differ
diff --git a/src/libs/common/config_os.h b/src/libs/common/config_os.h
index d17db3b13..f304343c2 100644
--- a/src/libs/common/config_os.h
+++ b/src/libs/common/config_os.h
@@ -2,7 +2,7 @@
 #define CONFIG_OS_H_
 
 
-#define PESTPP_VERSION "4.3.19";
+#define PESTPP_VERSION "4.3.20";
 
 #if defined(_WIN32) || defined(_WIN64)
 #define OS_WIN
diff --git a/src/libs/pestpp_common/OutputFileWriter.cpp b/src/libs/pestpp_common/OutputFileWriter.cpp
index 89a9148b2..0aaa30fcb 100644
--- a/src/libs/pestpp_common/OutputFileWriter.cpp
+++ b/src/libs/pestpp_common/OutputFileWriter.cpp
@@ -231,6 +231,20 @@ void OutputFileWriter::scenario_report(std::ostream &os, bool report_mode)
 	{
 		mode = "regularization (with a \"z\")";
 	}*/
+
+	os << endl << "    This software has been approved for release by the" << endl;
+	os << "    U.S.Geological Survey(USGS).Although the software has " << endl;
+	os << "    been subjected to rigorous review, the USGS reserves the" << endl;
+	os << "    right to update the software as needed pursuant to further" << endl;
+	os << "    analysisand review.No warranty, expressed or implied, is " << endl;
+	os << "    made by the USGS or the U.S.Government as to the" << endl;
+	os << "    functionality of the softwareand related material nor shall" << endl;
+	os << "    the fact of release constitute any such warranty." << endl;
+	os << "    Furthermore, the software is released on condition that" << endl;
+	os << "    neither the USGS nor the U.S.Government shall be held" << endl;
+	os << "    liable for any damages resulting from its authorized " << endl;
+	os << "    or unauthorized use." << endl << endl;
+
 	switch (pest_scenario.get_control_info().pestmode)
 	{
 	case ControlInfo::PestMode::ESTIMATION: 
diff --git a/src/libs/run_managers/abstract_base/model_interface.cpp b/src/libs/run_managers/abstract_base/model_interface.cpp
index f0ee413ea..5a47254f5 100644
--- a/src/libs/run_managers/abstract_base/model_interface.cpp
+++ b/src/libs/run_managers/abstract_base/model_interface.cpp
@@ -956,13 +956,13 @@ void InstructionFile::throw_ins_error(const string& message, int ins_lnum, int o
 {
 	stringstream ss;
 	if (warn)
-		ss << "InstructionFile warning in " << ins_filename;
+		ss << "InstructionFile warning in '" << ins_filename << "'";
 	else
-		ss << "InstructionFile error in file " << ins_filename;
+		ss << "InstructionFile error in file '" << ins_filename << "'";
 	if (ins_lnum != 0)
-		ss << " on line: " << ins_lnum;
+		ss << " on instruction file line: " << ins_lnum;
 	if (out_lnum != 0)
-		ss << " on output file line: " << out_lnum;
+		ss << ", on output file line: " << out_lnum;
 	ss << " : " << message;
 	if (warn)
 		cout << endl << ss.str() << endl;
@@ -1069,7 +1069,7 @@ pair<string, pair<int, int>> InstructionFile::parse_obs_instruction(const string
 	}
 	catch (...)
 	{
-		throw_ins_error("error casting first index '" + temp.substr(0, pos) + "' from (semi-)fixed observation instruction '" + token + "'");
+		throw_ins_error("error casting first index '" + temp.substr(0, pos) + "' from (semi-)fixed observation instruction '" + token + "'", ins_line_num);
 	}
 	try
 	{
@@ -1078,7 +1078,7 @@ pair<string, pair<int, int>> InstructionFile::parse_obs_instruction(const string
 	}
 	catch (...)
 	{
-		throw_ins_error("error casting second index '" + temp.substr(pos) + "' from observation instruction '" + token + "'");
+		throw_ins_error("error casting second index '" + temp.substr(pos) + "' from (semi)-fixed observation instruction '" + token + "'");
 	}
 	pair<int, int> se(s-1, e-1);
 	return pair<string, pair<int, int>>(name,se);
@@ -1104,12 +1104,17 @@ pair<string, double> InstructionFile::execute_fixed(const string& token, string&
 	}
 	catch (...)
 	{
-		throw_ins_error("error casting fixed observation '" + token + "' from output string '" + temp + "'");
+		throw_ins_error("error casting fixed observation instruction '" + token + "' from output string '" + temp + "' on line '" + line + "'",ins_line_num, out_line_num);
 	}
 	int pos = line.find(temp);
 	if (pos == string::npos)
 		throw_ins_error("internal error: string t: '"+temp+"' not found in line: '"+line+"'",ins_line_num,out_line_num);
+	if ((value != 0.0) && (!isnormal(value)))
+	{
+		throw_ins_error("casting '" + temp + "' to double yielded denormal value on line '" + line + "' for fixed observation instruction '" + token + "'", ins_line_num, out_line_num);
+	}
 	line = line.substr(pos + temp.size());
+	
 	return pair<string, double>(info.first,value);
 }
 
@@ -1129,9 +1134,9 @@ pair<string, double> InstructionFile::execute_semi(const string& token, string&
 	int len = (info.second.second - info.second.first) + 1;
 	int pos = last_out_line.find_first_not_of(", \t\n\r"+additional_delimiters, info.second.first); //include the comma here for csv files
 	if (pos == string::npos)
-		throw_ins_error("EOL encountered when looking for non-whitespace char in semi-fixed instruction '" + token + "'",ins_line_num,out_line_num);
+		throw_ins_error("EOL encountered when looking for non-whitespace char in semi-fixed instruction '" + token + "' on line: '" + line + "'",ins_line_num,out_line_num);
 	if (pos > info.second.second)
-		throw_ins_error("no non-whitespace char found before end index in semi-fixed instruction '" + token + "'", ins_line_num,out_line_num);
+		throw_ins_error("no non-whitespace char found before end index in semi-fixed instruction '" + token + "' on line: '" + line + "'", ins_line_num,out_line_num);
 	pest_utils::tokenize(last_out_line.substr(pos), tokens);
 	temp = tokens[0];
 	try
@@ -1141,11 +1146,15 @@ pair<string, double> InstructionFile::execute_semi(const string& token, string&
 	}
 	catch (...)
 	{
-		throw_ins_error("error casting string '" + temp + "' to double for semi-fixed instruction", ins_line_num, out_line_num);
+		throw_ins_error("error casting string '" + temp + "' to double for semi-fixed instruction '" + token + "' on line: '" + line + "'", ins_line_num, out_line_num);
 	}
 	pos = line.find(temp);
 	if (pos == string::npos)
 		throw_ins_error("internal error: temp '" + temp + "' not found in line: '" + line + "'", ins_line_num, out_line_num);
+	if ((value != 0.0) && (!isnormal(value)))
+	{
+		throw_ins_error("casting '" + temp + "' to double yielded denormal value for semi-fixed instruction '" + token + "' on line: '" + line + "'", ins_line_num, out_line_num);
+	}
 	line = line.substr(pos + temp.size());
 	return pair<string, double>(info.first,value);
 }
@@ -1155,7 +1164,7 @@ pair<string, double> InstructionFile::execute_free(const string& token, string&
 	vector<string> tokens;
 	pest_utils::tokenize(line, tokens,", \t\n\r" + additional_delimiters) ; //include the comma in the delimiters here
 	if (tokens.size() == 0)
-		throw_ins_error("error tokenizing output line ('"+last_out_line+"') for instruction '"+token+"' on line: " +last_ins_line, ins_line_num, out_line_num);
+		throw_ins_error("error tokenizing output line ('"+last_out_line+"') for free instruction '"+token+"' on line: " +last_ins_line, ins_line_num, out_line_num);
 	double value;
 	try
 	{
@@ -1164,7 +1173,7 @@ pair<string, double> InstructionFile::execute_free(const string& token, string&
 	}
 	catch (...)
 	{
-		throw_ins_error("error converting '" + tokens[0] + "' to double on output line '" + last_out_line + "' for instruciton '"+token+"'", ins_line_num, out_line_num);
+		throw_ins_error("error converting '" + tokens[0] + "' to double on output line '" + last_out_line + "' for free instruciton: '"+token+"'", ins_line_num, out_line_num);
 	}
 	string name = token.substr(1, token.size() - 2);
 	int pos = line.find(tokens[0]);
@@ -1172,6 +1181,10 @@ pair<string, double> InstructionFile::execute_free(const string& token, string&
 	{
 		throw_ins_error("internal error: could not find free obs token '"+tokens[0]+"'", ins_line_num, out_line_num);
 	}
+	if ((value != 0.0) && (!isnormal(value)))
+	{
+		throw_ins_error("casting '" + tokens[0] + "' to double yielded denormal value for free instruction: '" + token + "' on line: '" + line + "'", ins_line_num, out_line_num);
+	}
 	line = line.substr(pos + tokens[0].size());
 
 	return pair<string, double>(name,value);
@@ -1260,6 +1273,8 @@ void InstructionFile::execute_line_advance(const string& token, string& line, if
 	int num;
 	//pest_utils::convert_ip(token.substr(1), num);
 	num = stoi(token.substr(1));
+	if (num < 1)
+		throw_ins_error("line advance instruction error: number of lines must be greater or equal to 1, not '" + token.substr(1) + "'",ins_line_num,out_line_num);
 	for (int i = 0; i < num; i++)
 	{
 		if (f_out.bad())
diff --git a/src/libs/run_managers/yamr/PantherAgent.cpp b/src/libs/run_managers/yamr/PantherAgent.cpp
index d0807b17e..21e444e60 100644
--- a/src/libs/run_managers/yamr/PantherAgent.cpp
+++ b/src/libs/run_managers/yamr/PantherAgent.cpp
@@ -13,6 +13,7 @@
 
 #include "Pest.h"
 #include "config_os.h"
+#include "pest_data_structs.h"
 
 using namespace pest_utils;
 
@@ -504,8 +505,7 @@ void PANTHERAgent::start_impl(const string &host, const string &port)
 		if (err.first == -999)
 		{
 			ss.str("");
-			ss << "error receiving message from master: " << err.second << " , terminating, header follows:";
-			net_pack.print_header(ss);
+			ss << "error receiving message from master: " << err.second << " , terminating";
 			report(ss.str(), true);
 			//terminate = true;
 			net_pack.reset(NetPackage::PackType::CORRUPT_MESG, 0, 0, "recv security message error");
@@ -872,8 +872,17 @@ void PANTHERAgent::start_impl(const string &host, const string &port)
 				report(ss.str(), true);
 				serialized_data = Serialization::serialize(pars, par_name_vec, obs, obs_name_vec, run_time);
 				ss.str("");
-				ss << "debug loop returning ctl obs for run_id, group_id: " << run_id << "," << group_id;
-				net_pack.reset(NetPackage::PackType::RUN_FINISHED, group_id, run_id, ss.str());
+				double rd = ((double)rand() / (double)RAND_MAX);
+				if (rd < 0.1)
+				{
+					ss << "debug loop returning failed run for: " << run_id << "," << group_id;
+					net_pack.reset(NetPackage::PackType::RUN_FAILED, group_id, run_id, ss.str());
+				}
+				else
+				{
+					ss << "debug loop returning ctl obs for run_id, group_id: " << run_id << "," << group_id;
+					net_pack.reset(NetPackage::PackType::RUN_FINISHED, group_id, run_id, ss.str());
+				}
 				err = send_message(net_pack, serialized_data.data(), serialized_data.size());
 				if (err.first != 1)
 				{