Sure,
Please find here the screenshot of part of the new role form in the WordPress background, where the tool tip popping up when the mouse hovers on the question mark is unreadable (very light grey text on white background).
As mentioned, you can see here a screenshot of part of a foreground page where the tool tip popping up when the mouse hovers on the question mark is clearly readable (white text on black background). So on foreground pages, no problem.
Kind regards,
Jacques Beckand
NB: this problem in the Ultimate Member background pages does not happen in my other WordPress background pages, a.o. in other extensions.