[ubuntu_studio] jack broken after 11.10 -> 12.04 upgrade

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http://ubuntuforums.org – Everything worked fine in 11.10. Upgrading to 12.04 has introduced errors in starting jack?? Initially, I was using QJackctl and found that it was using /usr/bin/jackdmp for the server. This was in the setup>options page. I was getting an error along the lines of 'cannot start server err - file does not exist'. changing the setting to just 'jackd' or 'jackdmp' alleviated this error message, but no audio was working. QJackctl did however recognize my audio devices in the connections window. A few reboots later, QJackctl just hangs (no GUI, just a gray box with a title bar) and trying t (Hardware)