thx for the reply jochen...
I run on FW 2.6.40.
The navcoder log file is empty I'm afraid, the only way to get data in the logfile is to disconnect the cable and do a scan. The minute I connect the cable to the system navcoder freezes and crashes... I suppose it doesnt have the time to write a log
some pics :
Here's a movie to illustrate wat's going on:
007.flv video
It kinda freezes there and makes a sound

no message or errorcode whatsoever. When I pull the cable out navcoder dissapears and the logfile hasn't been altered...
Hope you can figure it out