Lpc2000

There are several examples of the LPC2148 USB port
usage, though there are very difficult to adapt for
user's need.  But, besides, some have very strange
behaviour.  For example the USBHID from Keil, running
on the MCB2148 evaluaton board.
To be recogized by PC, the USB cable should be disconnected
from the board and then connected again.  After it
the example starts to work..., but until the microcontroller
was reseted.  Then one again needs to repeat the
disconnect/connect procedure to make the board work.
Sure, such software is useless for more or less real usage.
For example, the microcontroller can be resetted by the
watchdog and the USB connection will be lost.
So my questions:

1. Is such behaviour property of LPC2148 or just the
Keil example?
2. Are there available examples of the LPC2148 USB usage
without such problems?

By the way, I have designed a PCB with the FT2232C chip
and LPC21x8 microcontroller and such a couple of chips
work very well and practically no problems with the USB
programming.

Varuzhan