UI Audio Issues following sleep with External Speakers

Hi
I have a May 2011 27inch iMac that I upgraded to Lion.
I use a set of Aego Acoustic Energy Speakers plugged in via the headphone port.
All works fine until I put my mac to sleep, upon restoring from sleep some UI sounds stop working. iTunes, and QuickTime play fine but I get no sound when emptying trash, dragging folders, new email, send email etc.
The strange thing is if I unplug the speakers then all the sounds play in one continuios blast so I can new mail sound x8 send mail sound x6 etc then if I plug the speakers back in all is fine again until I send the mac to sleep and then problem starts again.
A restart also sorts this out but its a pain having to unplug / replug in my speakers everytime my mac sleeps. It was fine under Snow Leopard.
I was hoping the 10.7.1 update was going to fix it but it hasn't.
Any help would be much appreciated.
Thanks
Richard

My console shows the following messages when during the "sound blast sequence." This problem has persisted through a clean OS install.
11/2/11 1:10:25.362 PM com.apple.backupd: Backup failed with error: 19
11/2/11 1:28:08.000 PM kernel: HID tickle 35090125 ms
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 3047 goto Exit
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 3047 goto Exit
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 3047 goto Exit
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 4490 goto Exit
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4472 goto handler
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4062 goto handler
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4072 goto handler
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 4490 goto Exit
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4472 goto handler
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4062 goto handler
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4072 goto handler
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 4490 goto Exit
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4472 goto handler
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4062 goto handler
11/2/11 1:28:09.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4072 goto handler
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 4490 goto Exit
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4472 goto handler
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4062 goto handler
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4072 goto handler
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 4490 goto Exit
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4472 goto handler
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4062 goto handler
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4072 goto handler
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 == fAudioEngineArray" failed in AppleHDADriver at line 4490 goto Exit
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4472 goto handler
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4062 goto handler
11/2/11 1:28:10.000 PM kernel: Sound assertion "0 != result" failed in AppleHDADriver at line 4072 goto handler

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