IMac won't go into sleep mode when Kensington Dome Hub

Has anyone had problems with their computer sleeping when the Kensington USB Dome Hub is connected. This just started happening a few days ago. I isolated the problem and it is definitely the Kensington HUB -- there is nothing connected to the hub that should wake the mac up -- all I have plugged into it is a lacie dvd burner and an epson scanner-- Thanks for any advice.
Deanna

I would call Kensington and see if this is a known problem. I assume that you have checked and have downloaded the latest software for the hub, although I doubt that it has any.

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