Cubase slow and not working correctly

Cubase is extremely slow the last days (Mac). Just now it crashed again. I can not ask for support on the steinbergsite because the form does not proceed. I have to chose the product, but there is noting to enter or to chose from (popups are allowed). See crash report attached. Please advise.

Also, when I try to select an extension for audioproduction (Melodyne or Vocalign) sometimes these are greyed out in the audio menu.
Cubase 10.5_2020-07-09-170312_MacBook-Pro-van-Rick-2.crash (134 KB)


This crash has been reported already, thank you.