I have just started my machine this morning to find my Non package manager plugins are missing, version 7.14.
My libraries folder has the sub folders in there but all files are missing. I did open in RiR before native rhino this morning but the problem obviously exists in both as the files have gone.
Package manager plugins seem to be OK. I will copy my library back and see what happens but flagging it in case it becomes an ongoing problem.
I did have a similar previous issue in RiR: All Grasshopper tabs missing - Tried runtime XML workaround - #2 by Japhy. Although I think this is different as my libraries files were not deleted before and the previous issue was also causing problems with package manager plugins.