NOTE: The below issue was fixed by simply exiting to the shell and returning. Posting it anyway, just FYI.
After updating to 2.9
Attempting to add a new Tab on MONITOR 1 (the one with the CIA)
The Display Picker Tools were broken.
Clicking a tool doesn't load the new Tab, it just "escaped".
Closed all Tabs but Tab 1 before adding new Tab.
However, on MONITOR 2, the Display Picker Tool functioned as expected.
Tabs could be "picked" on Monitor 2 and moved to Monitor 1