This problem has plagued RB since I have started using it in 2015...

If you try to add a cowbell, or tambourine and a few other drum instruments I can't recall which ones, then RB crashes.

I have tried the fix that has been suggested many times of making RB run via admin, which USED to fix this issue, it NO longer does.

Please, please fix this nagging bug in the software.

BTW I am still on BB and RB 2019.


And also - I cannot even load any loops into my RB file, which I've never had that problem before.

If you have 2019 you should have the Biab Plugin though the newer version works better it should still do the job similar to RB.
But you might be better trying that in a DAW, if you don't have one there is free Cakewalk by BandLab that should handle loops ok.

If you revert to build 3 for 2019 loops will work.
It is a known issue for the last build of 2019.