I have experienced the same thing many times over the past two years on Mac OS, usually when working on a large file for a long time. Saving the file and quit/reopen Poser sorts it out. What I have been experiencing effects the whole parameters palette were a user can not select different parts of a figure or actor. I have had a similar experience with the memory dots and work spaces. They become unresponsive and a user needs to quit and reopen Poser. The issue has been present on 11.3 and 11.2 for Mac.