USB drive only seen in daisy chained port

Hi, I have a 16 gig USB drive that works fine on my (Windows XP) work PC and it used to work fine on my MacBook in both Windows XP and Mac OS X. Since today, though, it has started behaving very badly on the MacBook in both OS's - if I plug it in directly to any port on the side of the laptop I can sometimes get it to mount, but not every time, but I can't copy files from it and it refuses to eject in OS X. However, if I plug it into a USB port chained from the Apple keyboard then it works fine.
Does anyone have any ideas? I need the USB drive for off-site work next week and would prefer not to have to fit the extra keyboard into the laptop bag!

I've posted this in the wrong place, gah. I think it should probably be in the MacBook forum but don't know if I can move it...

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