Custom time signature note-group/beam options in Master Palette are solid black
1. Open a score.
2. Access the Master Palette menu (def. key 'Z').
3. Navigate to the 'Time Signatures' tab.
Expected: The area which displays notes with beam groups to be customised can be seen.
Actual: The area which displays notes with beam groups to be customised is completely black and unclear.
The field can still be interacted by dragging a note-beam option unto a note which would usually appear there. Custom note groups do appear in the score; only the interface where they would be customised is obscured.