Certain locations fail to create a proper reference line buffer

[fmemuir]

Might be to do with the reference line shapefile itself, but certain sites fail to create a proper reference line buffer that runs along the reference line shapefile. The shapefile itself looks good (all one feature, no breaks or multiparts), but when the buffer is generated, it only covers the first 20% of the line. One temporary fix for this is to expand the minimum distance for the buffer so that it covers the whole reference shoreline. But it should be investigated to make sure something weird isn't happening with Toolbox.ProcessRefline() which is causing the buffer to be cut off early. Perhaps a reprojection bug? Or a bug in Toolbox.spaced_vertices()?