Labels are missing after re-installing plugin?

[ProX666]

I am working in "the cloud" for my company. Plugins for QGIS are not automatically installed and do not stay fixed once installed. So, I have to add those plugins each time. I did some major work on labelling a project. It looks great. I did edit and save the lot and used Memory Layer Saver to make the data persistent. The file myproject.qgs.mldata was there and had data. Now I wanted to continue with the project. So I did login to the cloud and opened my QGIS project. No labels there. So I did install the both plugins; still no labels. There is no data anymore in the attribute fields too. So it seems that the myproject.qgs.mldata has been reset while loading the plugins?