Would you do a very quick test for me please prock…? I can’t install and check myself yet; right in the middle of an album project, which I am not going to upset any til its done… 
Follow these quick steps:-
1. Open MIDI Key Editor
2. Select a MIDI note and drag to a new note position
3. The info tool tip that shows the relative position information when you move the note is an unreadable white box unless it moves over an existing note
Is the floating tooltip, still showing as white text on a white background box…?
Cheers,
Bob
PS:- this was due for fixing, (BON-4943 - a graphical glitch that manifests throughout the program) but is not listed in the Version History - so I’m not hopeful; but sometimes things do get addressed, but are just not listed there…