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ARM9: USB (UDP) and ULINK-Debugging

Hi,
I took the USB-CDC-example out of the current software package for the AT91SAM9260 from ATMEL and changed it to get successfully compiled using the RealView Compiler.
The problem now is, that the USB-handler interrupt service routine does not getting called while debugging with an ULINK2.
If I download the program to data flash and do not debug, the interrupt gets called (I did some dbgu-output) but the device is still not identified by windows (vendor and device ID equals 0000).

Does someone have similar problems or even a solution?

Many thanks,
Stefan

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