Hi Rokas, thanks for the reply.
I can confirm the update is somewhat buggy, the installer itself is messing something up while updating from 2021 to 2021.1, though I cannot speak for the standalone installer itself.
The update was a bit difficult to find, it was only listed in the autodesk desktop app, no notification arrived about it, one had to look for it specifically.
I ran into the same problem as the people in the autodesk forum did, however removing the "ENU" folder and letting max reset the whole UI with a full reinstall of all the plugins solved the problem.
Anyway, thanks for having a look, could you please bump this thread when iToo has an update for 2021.1 + vray5beta2?
Thanks in advance.