> I have checked with a
> voltmeter to see that the pullup is on the D+ line in both cases.

I assume that by now you have eliminated all probably causes, so it is
time to look for the less probable and totally improbable ones. One
thing that I would try is to cut a USB cable in half, reconnect the
wires with the D+ and D- crossed, and try that.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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