No other program are affected, reboots do not help. I can no longer adjust the vertical size of the overall workspace. This is a problem in that the program always opens too large vertically for my screen so I routinely shrink it from the upper right, re-position, then enlarge from the lower right to fit properly - an old annoyance, but never a problem until recently.
The change occurred "around" the time of the recent updates to...I think, PSF?