Hey guys, I actually managed to work around this particular problem recently. If you open up the MonitorCenter.py script in an editor like Visual Studio Code or Brackets (ProgramFiles → PsychoPy → Lib → site-packages → psychopy → monitors → MonitorCenter.py) and go to line 1121. Just above that line, at the top of that little code snippet, you’ll see a bit of code that reads:
butBox = wx.BoxSizer(wx.HORIZONTAL)
If you change “axHORIZONTAL” to “axVERTICAL” and then save the script (you’ll need to be logged in as an administrator to save it) the luminance table appears just fine. The OK and CANCEL buttons will not be stacked one on top of the other, which is a little janky, but otherwise it works fine.