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I've seen this as well. I suspect that it's a power problem.
Yes the USB definition is for 500 mA and some units do provide more than 500 mA.
So if you go into the Control Panel - System on the PC and look at the USB host, you can see the power draw of the devices attached via usb.
My personal experience is that my Fiva MPC-206e notebook won't charge my iPAQ however my Intel 815EEAL motherboard will if I plug it in direct. If I use a USB keyboard with a hub, I can't plug in the iPAQ to charge into it.
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