Blender acts funny, keeps some of my settings like theme, if I uninstall then reinstall. Some other settings were in user preferences and loop cuts not always working correctly and when I alt-right click next to some loop cuts I got all my vertices to to be selected. Even when starting up my 3d cursor is off by few squares and if I set the cursor to center and I add a plain…It wont lay flat its at a angle. After a few uninstalls and installing on a different drive I was able to set the cursor to sent and have it stay (also deleting some files from other versions that were installed and deleted all downloaded files) Any ideas what it might be…Its windows 10. I was thinking that maybe the c drive had a recovery partition but, nothing comes up on my computer that might be backing up the settings or something on each install.
try deleting userprefs.blend and the startup.blend files. I don’t actually know where they are off the top of my head, but deleting it and letting blender make a new version should solve the issue. I hope this helps!