@GriffinsWing Hi. Sorry to hear you’ve been dealing with these difficulties. This problem oddly resembles one we had before with an older version, but this was fixed many months ago. However the only suitable explanation is that you’re using Windows 10 which has been found to be very unfriendly towards third party apps due to recent changes on security protocols, and Pencil2D has been affected by this as well.
If you are using Win10, please remove your current version of Pencil2D and re-download Pencil2D 0.6.4 from http://pencil2d.org/download and immediately after downloading follow this recommendations guide from start to finish. [Guide] How to Train Your Pencil2D (Windows)
On the other hand to prevent losing work please also take some time to follow this other guide Pencil2D Project File Corruption Prevention / Partial Recovery Guide
It has tips and considerations to prevent losing work and recover it on various circumstances regardless of Operating system.
Once a file has been blanked out we can’t recover it, but if you have the Windows backup option enabled you could potentially restore the previous state of files as seen on this guide: https://www.pcworld.com/article/2974385/how-to-use-windows-10s-file-history-backup-feature.html
All in all, we’re sorry that you had to deal with these issues Pencil2D is still under development and due to it’s open source nature we depend on users to report these issues to us as even after careful testing and QA procedures there are corner cases that can’t be predicted, only acted upon. Cheers.