Hi. Thanks for the reply. No, it's not powered (and can't be) - which I'm sure is part of the problem. So, I assume, I need one that is.
It's strange though, I can't figure out why the Exilim camera dock and the Treo dock (both of which have there own power sources) need a direct connection to the Mac to work consistently. Does it have something to do with polling the USB ports? And, if so, will a powered connection solve this?