From a perfect working 2019 version, I updated 2019 to V21.
Disabled legacy display ==> I can open an existing BOM
Disabled legacy display ==> I can't create a drawing from out of the home window, V21 crashes without an error
Disabled legacy display ==> I can't open an existing drawing, V21 crashes without showing an error
Enabled legacy display ==> I can open an existing BOM => after closing file and closing Alibre error pops up for 2 -3 seconds. see attached
Enabled legacy display ==> I did try to open a new empty part and the after rendering was done, but before showing the empty part, V21 crashed, no error
I will uninstall V21 now again (for the fourth time), clean out registry and install 2019 again. (For the fifth time)