HID example does not write to LPC2148

Hi,
I have build the LPC2148 evaluation board based on Keil schematic, just with basic connections.
I have downloaded HID example and I got the LPC to enumerate. When I run the HIDClient.EXE on Windows XP it hangs on. When I run the HIDClient from the debugger I am able to read the status of the switch on the board. When I try to switch on, off the light on the board the program hangs on until
I disconnect the USB. WriteFile function hangs on until I disconnect USB and after that returns 0.
ReadFile works just fine.
Is there anything I am overlooking, something in building the evaluation board. I just connected USB,
power from external power supply reset and boot switch and one LED.
Thank you,
Milan Madzarac

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