I haven't had chance to play with TT in the new beta yet, but if you can reproduce this problem, Please
enable logging, reproduce the problem and submit your PokerTracker.log file to the
Support system , and link to this thread in the reference field of the ticket so that we can investigate.
(EDIT: I've just tried it and opened maximum tables at Party with no issues, so if you're still having trouble, please submit your log)