Scanner/Camera via USB not recognized under 10.8

Hi there,
after installing 10.8 on my 2011 iMac, neither my Lexmark Scanner nor my Camera are recognized via the USB-port by Image capture or iPhoto respectively; no matter if connected via USB-hub or directly to the iMac.
Odd enough, sending faxes or printing with the Lexmark works perfectly allright over the very same USB-connection, as well as p.e. dongles are recognized.
Needless to mention, with 10.7.4 everything went just fine; I updated the Lexmark drivers, I repaired permissions after the first install of 10.8 and even did a second install in the meantime - same prob!
Any ideas???
THANKS and a wonderful weekend for You all...

So, as there was no help anywhere, neither from the guys at Lexmark nor here, I knew no better than to downgrade again to 10.7.4 (using TimeMachine) and: immediately the prob was solved, the scanner as well as the camera work just fine... odd thing, all the more as I seem to be the only one having this strange USB-bug...

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