Nuendo 11 crashes when editing macros

At the moment I am trying to create and edit new macros.
When adding new commands to a macro , sometimes nothing is added, the hourglass (mouse pointer) goes to fully busy --> Crash.
When deleting a command - every second attempt the hourglass goes to fully busy --> Crash
I have 3 licenses here, that happens on every PC.
Nuendo 11, Windows 10x64 / 19042.746 20H2.

I never had this problem the last years.