The issue you are seeing is happening because of the beta build of Monterey. We do not support beta builds of new macOS.
We have been testing our application on new macOS and will be releasing the new MindManager 13.2 build which will work on macOS Monterey after its official release.
Thank you for your patience,
Would your answer also be relevant for my case (attached)?
If so, when are you planning to oblige us with a functional release?
works now with 13.2.206!