Upgraded from iMac to MBP - now USB & Firewire hubs don't work

Hi there,
I've just upgraded from a 2008 C2D 20" iMac to a new 2011 13" MBP i5. I'm running Pro Tools 8LE via a Digi 003 rack & have a Command8 plus other USB/FW400 devices in my set up. I've always used both a USB hub & a FW400 hub to connect everything to the iMac (daisy chaining causes some instability issues / track restriction in Pro Tools).
Now however, the MBP doesn't see any devices connected via the hubs. If I connect directly & daisy chain the devices, they work. I have the USB hub connected to the MBP with a FW800-FW400 cable.
Any idea what's causing this? Here's links to both hubs... they have been working fine with this setup for 3 years:
http://www.belkin.com/IWCatProductPage.process?Product_Id=198333
http://www.belkin.com/IWCatProductPage.process?Product_Id=196166
Thanks

I had the same problem with my desktop Mac, and resolved the hub situation by following two suggestions: (1) daisy-chaining the devices (which you're already doing) and (2) reset the hub. For the latter, pull out your devices/hubs, reboot your MBP, and put the devices/hub in. This resets the hubs so you can use them again.
It also might help if you make sure you've plugged in the wall outlet; this increases the power available to your devices.
I'd be very interested if these fixes work.

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