Core Audio Drivers not Found Error (no Logic Pro Installed)

I am receiving the following error in GarageBand 08 and was hoping someone might be able to assist.
When recording with a USB mic in GarageBand 08 (MXL USB.006) I sometimes get the following error: (Core Audio Drivers not Found). The error occurs after I have completed a recording session and removed the USB mic. (The error occurs regardless of if I close GB before removing the mic; but only occasionally)
In checking the GB preferences, the Built-In audio option has disappeared from the drop down menu entirely for both Audio Input and Audio Output (although it still can find the USB mic if I reattach). In the Utilities folder, audio preferences, the Built-In audio option is also missing from the drop downs. (Not grayed out -- missing).
In researching the problem, it looks like a similar problem occurs with the Logic Pro suite but I don't have that installed on my Mac (and never have). In contacting MXL support, they noted that it was a problem with Leopard and they didn't have a fix.
At this point, I'm looking for either (1) a fix I've missed in my research or (2) an easy way to reinstall/replace/find the drivers without having to restore my system from backup. I've received the error three times now and restoring from back up - which clears the error and restores the drop down - is getting tiresome.
Thank you!

Thank you for the suggestion! I believe that was the issue the first time I lost the drivers. Unfortunately, even resetting the inputs and closing GB before disconnecting doesn't guarantee my Built-In audio won't disappear. Thank you for trying though!

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When i try to open my projekt in logic pro x it say audio files not found?

when i try to open up a projekt in logic pro x it say audio files not found why is this heppends?

This error typically means the audio files you used in this project are no longer found in their original location.. (did you move or delete them?) or you have renamed the audio files..... or they were located on an external HD etcand that drive or disk is no longer available.... because its not plugged in.

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I've been running my current setup for about eight months now (new Mac Pro, latest versions of Logic Pro and OS) with no problem at all.
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Message was edited by: J A Bohrer

When I was on the phone with M-Audio Tech Support (they're quite helpful) we noted the following:
1. If you switch over to Core Audio using the Mac's Internal speaker in one of these projects (switch to Apple's internal Core Audio Driver). All Channels are immediately updated to show only Output 1-2 available. and the project plays through channels 1-2 and the MacPro Speaker.
2. Switching back to DAE Core Audio, all available channels are updated and all plays/records normally using the Digidesign HW (HD) Core Audio Driver.
3. When the ProFire Lightbridge Core Audio Driver is selected, all channels are updated (now 1-18) and available, but if you select a channel or channel pair on one of the Channel Strips that was not in use previously in this session, an "out" bus for that channel is not created in Logic (which it normally does, assuming you choose a new channel pair for output from a channel strip...)
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...J
Message was edited by: J A Bohrer
Message was edited by: J A Bohrer

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