LTSP Clients and USB devices

[Harry Sweet]

We are this year running a digital photo class via LTSP and need to have working USB on the clients.  We do now with a new install, but I've seen it stop working after doing updates.  I'm nervous that I might break this once I do the updates.
 
This is a 8.04 64 bit install with 32 bit clients.
 
Is there any known update kernal or otherwise that would cause this to occur?
 
thanks
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