Hello,

After updating, I had to reinstall the application in order to avoid the following issues, and I think I found a workaround:

BOINC no longer showing in start menu, appears that start menu directory is no longer created post install (ran as admin)
Same issue now occurring with older versions, such as 8.0.2 and 8.0.4 (using 8.2.4 at time of writing)
Could not set current working directory (error 5: access is denied)
Also received a gpu(?) related error, having trouble reproducing it

Run as administrator seems to fix these issues. I received the following: "Invalid client RPC password. Try reinstalling BOINC." I click okay and the program seems to work fine without further adjustment. Closing and opening the program: error no longer appears.
One project was having upload issues (Asteroids@home), seems to be okay now.

Solution: open boincmgr from the file directory, properties, check Run As Administrator, create shortcut/pin to taskbar if desired, run program. I did not have to reapply login credentials or add projects at all during this time. Based on that, I wonder if some information is not fully removed/changed post uninstallation or update.
Windows 11

Based on that, I wonder if some information is not fully removed/changed post uninstallation or update.
Windows 11

It isn't all removed, the idea being that a fresh install of a newer version can keep all your project information.

Somewhere on these boards are instructions to remove everything should you want to stop crunching or things have gotten so messed up you need to start from scratch.