Although we have multiple reports by now, we cannot reproduce this on any of our Macs (Apple Silicon and intel). If you experience such a freeze when quitting MT Pro, please report it here and attach or copy/paste a Sample, collected with Activity Monitor (see here for how to do that).
(it’s better to copy/paste the report directly than to create a PDF from it, because the PDF will wrap the long lines).
We will report any progress/fix in this forum thread.
Thanks!