This morning, upon opening Flashprint (version 3.12.0 64bits), I got an "new update available" window. I downloaded, updated w/ v3.13.0 and OOOPS!
EVERY file I tried to slice ended up in a -very informative - "Something went wrong during slicing" message. This happened not only w/ new stl files, but also w/ previous stls (that v3.12.0 had sliced OK) and even w/ saved fpp ones.
Of course, trying to revert to the previous version by overwriting is not possible (you end up in "a more recent version is already installed" message), so I had to uninstall from control panel and reinstall from scratch.
Fortunately, previously stored user-printing profiles must be saved in some other directory (could'nt find where, if someone knows where these are stored please let me know to back them up, just in case) because they showed up normally (loosing that would have been a real PIA)
Since no release notes are included (just that should have be deterrent enough) I can't judge what I/we could be missing but for me, an occasional buggy slice is better than no slice at all...
Happy printing!