Can you go back to a past saving point in a project? I have a certain plugin that seems to crap out on me and disappear. I should have saved the plugins setting after I tweaked it....but like an idiot, didnt.
If your project folder contains a folder called "Project File Backups" you can definitely go back to a past saving point. Check the times and dates of the files in that folder, and open the one that is before you messed up the plug-in. When you go to save it, you can rename it back and save it over your messed up file.