[LAU] Sudden Jack problems

Hi. I have been using Jack, ALSA, and Ardour for some time without problems. A few minutes ago my Ubuntu update manager prompted me to update packages. I noticed that several of them were related to ALSA. I installed them and restarted (I didn't pay attention to what they were). Now Jack will not start. The failure message is pasted at the end of my mail here. I don't think I made any other change to the configuration. Is anyone else having trouble with Jack after an Ubuntu ALSA update? It was working well two days ago. I'm using Ubuntu Studio 64bit 9.10, ALSA 1.0.20, and a Beringher UCA202 USB soundcard. Thanks for your help. Peter Desjardins 21:34:46.120 JACK connection graph change. jack main caught signal 12 cannot read server event (Success) cannot continue execution of the processing graph (Broken pipe) <snip> cannot continue execution of the processing graph (Broken pipe) 21:34:46.143 Client deactivated. cannot continue execution of the processing graph (Broken pipe) 21:34:46.144 JACK was stopped successfully. 21:34:46.144 Post-shutdown script... 21:34:46.145 killall jackd