You have made great work on this plugin, thank you. I was testing the Mesh Simplification with the this Model and I have noticed that after increasing the slider above 15% a lot of faces are deleted.
Because of this very reason, we are completely changing the simplification engine right now. It will be much faster and much more robust. I tested your file and there are no holes until very high levels of simplification (>90%)
We don’t know exactly when this will be released, though.
Good to know that. I forget to mention that when I have tried to use social login (facebook-Google) on this forum but it didn’t work.