Logitech just released version 7.6 yesterday (in my opinion a little bit rushed, based on the forum posts and problems people have).
Anyway: some users are reporting crashs with SqueezePad (and every other iPad App) now, which I haven’t been able to reproduce myself yet.
Current investigation shows that this is related to players having a bogus playlist, so if this is happening to you, please use the web-interface to start some new song on each player as a start.
[update 01.09.2011] The latest SqueezePad version does not crash anymore with the 7.6.0 server. Also Logitech officially released 7.6.1 in the meantime, which would have fixed the problem as well [/update]
[update 27.07.2011] Logitech fixed the bug causing the crashes really fast in the meantime (see this bug-report).
You will either need to wait until Logitech releases 7.6.1 or download the new beta version tomorrow from here (please make sure, the version number is greater than 32918, today only 32905 is available)
Unfortunately such an error never turned up when trying the Betas of 7.6.
I keep you updated here if I find new information, sorry for the inconvenience.