Hello,
I have no idea what to think here. All of a sudden, all of my .pproj files (and auto saves) are missing off my computer. I was working in a project earlier today, even, and that file is gone, too. I thought I may have accidentally saved that file in a different location, and that's when I discovered that every single .pproj file I had saved was missing (dozens of them).
So, some background. I am using Adobe CC 2017. I had .pproj files saved both locally (on my D: drive--Windows) and in Dropbox (which is also synced to a separate folder on the D:drive of my PC). Both of these folders are also backed up by CrashPlan. All .pproj files have disappeared from the local folders, from Dropbox (local and web UI), and CrashPlan backup files. When I open PremierePro, it doesn't show anything under recent files. When I do a search of my computer, none of those missing files come up. They are not in the Recycle (Trash)--of course, as I did not delete them. Nothing else seems to be missing except for these .pproj files (and the associates auto save files). I still have all my After Effects project files (.aep). All the video and audio files that were in the same folders as the Premiere Pro project files are still there. So this definitely seems like the issue is with Premiere Pro.
How in the world did all these files disappear, and is there any way to get them back? I figured having the files backed up locally, through Dropbox, and through CrashPlan would be enough of a contingency plan to prevent the loss of data. However, I have never heard of (or experienced) anything like this before.