A few users have reported completely blank ribbon tabs while other tabs appear normal.
If this occurs the entire tab may look similar to the image below:
If you should run into this behavior there are a few recommendations to correct the display:
1. Use the ‘Restore Down’ option or ‘Maximize’ depending on your current state to adjust the size of the Revit window. This action should force a redraw \ re-size of all panels and typically corrects the ribbon:
2. Closing and re-opening Revit should also correct the display.
Why could this occur? Under some situations having Revit on a second display, changing the display resolution mid-session, or returning from a print \ print preview could trigger this appearance.
Afterward it should appear as expected: