You might have to try shutting down individual Windows one by one starting with the library. then open em up and dock them one by one this way you could figure out if it is just one of the features causing the problem or if it is a global issue " this is actually a primary problem to solve for the programmers " so if it would be caused just by one of the windows the issue could be fixed by letting it closed. the way I understand is that the most changes happen on the Library with integrating the Store so there might of happen a code conflict that is causing a mess on docking . also it might be a conflict by keeping the Preference files . when I tested the PP11.2 I noticed some strange behavior on install and startup affecting the Preferences. so it could be that Keeping the Preferences creates a conflict as they might not be compatible due the changes from 11.1 to 11.2 try deleting all Preferences manually to see if it might fix the issue, not just by setting it back to factory state.