USB Sound Card (Sound Blaster Extigy) has stopped working with 10.5.7

I installed 10.5.7 this morning and after reboot it was stuck on the blue screen for an extremely long time. Subsequent reboots were the same, slow on the grey screen, slow on the blue screen. Total boot time was over 10 minutes.

I tried resetting PRAM, booted into safe mode, re-installed 10.5.7 from the combo update and still had the same problem.

I then looked at system.log for any hints at what was going wrong, there were entries like:

May 14 16:57:01 tarsus configd[14]: InterfaceNamer: iMac8,1/AppleACPIPlatformExpert/PCI0/AppleACPIPCI/UHC5@1A,1/AppleUSBUHCI/Sound Blaster Extigy@3a200000/IOUSBInterface@2 [1]
May 14 17:09:20 tarsus kernel[0]: USBF: 804.220 AppleUSBHubPort: Port 2 of Hub at 0x3a000000 about to terminate a busy device (Sound Blaster Extigy) after waiting 10 seconds

This is compared to 10.5.6 where there were no references to the Extigy in system.log.

There are other messages referring to IOKit:

May 14 16:56:41 tarsus kextd[10]: IOKitWaitQuiet() timed out waiting to write kernel symbols
May 14 16:57:01 tarsus configd[14]: InterfaceNamer: timed out waiting for IOKit to quiesce
May 14 17:01:10 tarsus /usr/libexec/hidd[38]: Timeout waiting for IOKit to be quiet

Which again, were not present with 10.5.6.

So of course when I unplug the Sound Blaster Extigy it works fine, boots nice and fast and there are no issues.

I would really like to still be able to use my Sound Blaster Extigy. Is there any way I can fix this now myself, or a chance of it being fixed in an update?