I believe what you are experiencing is a known bug. You shouldnt have to reboot your computer though. You should be able to close PAH upon the freeze upon which you will receive an error popup message. A PAH restart should take care of it.
If this is the error you are experiencing; we are aware of it and it is our number one priority to get resolved for the next release.
If the error you are experiencing is different then what I mentioned above; please post a detailed explanation what is happening in the
PokerAce Technical Support Forums and we will try to help. Also, if you could please enable logging and super logging, in your preferences, and send the log file, which is located in your PAH install directory, to Josh it would greatly help in resolving the issue.
Best regards,
APerfect10