it must be a bug, that selecting objects in the 3d viewport is not working after using city engine for a short time. RMB is working (opening the context menu) but LMB has no effect (neither selecting nor steering the camera with "alt")
Is there a fix for the problem? I read the problem already existed a while ago, was fixed but seems to be "re-implemented" now.
Selecting objects is one of the most important functionalities, the application is not usable at all without that.