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I installed Ubuntu Studio 13.04 yesterday and Jack was working fine. Today when I tried to start it it said could not connect JACK server as client- overall operation failed. In the message box I got this:

14:18:16.319 Patchbay deactivated.
14:18:16.331 Statistics reset.
14:18:16.394 ALSA connection change.
14:18:16.803 D-BUS: Service is available (org.jackaudio.service aka jackdbus).
14:18:17.113 D-BUS: JACK server could not be started. Sorry
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
14:18:17.272 ALSA connection graph change.
Sun Jun 16 14:18:16 2013: Starting jack server...
Sun Jun 16 14:18:16 2013: JACK server starting in realtime mode with priority 10
Sun Jun 16 14:18:17 2013: ERROR: control open "hw:1" (No such file or     directory)
Sun Jun 16 14:18:17 2013: Acquired audio card Audio0
Sun Jun 16 14:18:17 2013: creating alsa driver ... hw:0,0|hw:1|16|3|22050|1|0|nomon|swmeter|-|32bit
Sun Jun 16 14:18:17 2013: ERROR: ALSA: Cannot open PCM device alsa_pcm for capture. Falling back to playback-only mode
Sun Jun 16 14:18:17 2013: configuring for 22050Hz, period = 16 frames (0.7 ms), buffer = 3 periods
Sun Jun 16 14:18:17 2013: ALSA: final selected sample format for playback: 16bit little-endian
Sun Jun 16 14:18:17 2013: ERROR: ALSA: cannot set period size to 16 frames for playback
Sun Jun 16 14:18:17 2013: ERROR: ALSA: cannot configure playback channel
Sun Jun 16 14:18:17 2013: ERROR: Cannot initialize driver
Sun Jun 16 14:18:17 2013: ERROR: JackServer::Open failed with -1
Sun Jun 16 14:18:17 2013: ERROR: Failed to open server
Sun Jun 16 14:18:18 2013: Saving settings to "/home/tyler/.config/jack/conf.xml" ...
14:18:31.563 ALSA active patchbay scan...
14:18:33.568 Could not connect to JACK server as client. - Overall operation failed. - Unable to connect to server. Please check the messages window for more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
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