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Problem with USB and KEIL startup file

Hi,
I took the USB-CDC-example from the AT91SAM9260 software package from Atmel and it works fine, as it is.

But when I exchange the startup file by the one, delivered with µVision and change the project settings, to suit the modifications, the USB enumeration is not working any longer. The VBUS_ISR is not called and thus the device does not know, that it has been plugged in.

Does anyone have the same behavior?
Any ideas how to solve it?

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