Connecting a scanner with USB Hub

Configuration: Scanner (Epson 7000 GT), printer (Canon 6200 S) are connected to a USB-Hub. The Hub ist connected to one of my macs (mini with 1,25 GHz oder G4 with DP 867 GHz).
When I don't use a hub there are no problems.
Scanning with the mini through the hub does work, when the hub is connected to the rear USB-port. Connecting to the hub through the keybord-hub (hub to hub), preview-scanning works. But doing the real scan fails. Only a twinkling status bar comes up and stays.
Using the G4 and the hub, Image Capture does not even find the scanner, no matter, which USB-port I use. But the scanner can be found in the System Informations.
With Gentoo-Linux on the G4, scanning and printing work perfectly. No matter, if I use a hub or not, so it is NOT a hardware issue!
Anyone who has the same problems?

If I waa you, I'd do a research on USB 3 scanners - here is some interesting info:
http://photo.net/digital-darkroom-forum/00YvPO

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vtwiz wrote:
Hi all,
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I have successfully hooked up the Airport Extreme
Base Station (n) with two printers using a USB Hub. I
am now trying to hook up an external hard
drive(acomdata 250 gb). When I plug the hard drive
into the Hub and turn the drive on the Airport
Extreme Base station resets to amber and flashes
green for a second then resets to amber again and it
keeps doing that until I shut the drive down. I have
a Mac Book Pro and an iMac on the network as well as
a HP pavilion a730n on the network. I am able to
share files between the PC and the Macs; however I
can't seem to share the external hard drive. I tested
the external hard drive by hooking it up directly to
the Mac book and after a few seconds it mounted
correctly and I was able to read and write.
Any help with this would be greatly appreciated.
Thank you.
Nick
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