[LAU] jackd does not start

Hello everyone, To my surprise, jackd could not start this morning (using qjackctl). User name was added to the audio group. The audio devices are: % cat /proc/asound/cards 0 [PCH ]: HDA-Intel - HDA Intel PCH HDA Intel PCH at 0xf7d10000 irq 53 1 [M1010LT ]: ICE1712 - M Audio Delta 1010LT M Audio Delta 1010LT at 0xd040, irq 18 Interface in qjackctl is specified as 'hw:M1010LT' Here's what happened: Sun Mar 31 07:37:23 2013: JACK server starting in realtime mode with priority 10 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 Sun Mar 31 07:37:23 2013: ERROR: Failed to acquire device name : Audio1 error : Method "RequestRelease" with signature "i" on interface "org.freedesktop.ReserveDevice1" doesn't exist Sun Mar 31 07:37:23 2013: ERROR: Audio device hw:M1010LT cannot be acquired... Sun Mar 31 07:37:23 2013: ERROR: Cannot initialize driver Sun Mar 31 07:37:23 2013: ERROR: JackServer::Open failed with -1 Sun Mar 31 07:37:24 2013: ERROR: Failed to open server So I tried with 'hw:1' from the drop-down menu: Sun Mar 31 07:34:57 2013: control device hw:1 Sun Mar 31 07:34:57 2013: ERROR: Failed to acquire device name : Audio1 error : Method "RequestRelease" with signature "i" on interface "org.freedesktop.ReserveDevice1" doesn't exist Sun Mar 31 07:34:57 2013: ERROR: Audio device hw:1 cannot be acquired... Sun Mar 31 07:34:57 2013: ERROR: Cannot initialize driver Sun Mar 31 07:34:57 2013: ERROR: JackServer::Open failed with -1 Sun Mar 31 07:34:57 2013: ERROR: Failed to open server What could be the cause of this problem ? - thanks !