ImageMate All-in-One USB 3.0 problems when connected to USB3.

I bought All-in-One USB 3.0 reader together with Sandisk Extreme 8GB card. I am using it with my MacBook Pro Retina Display.

It seems to work nice with the Extreme 8GB card. It does not work with my older ULTRA II 2.0 GB when connected directly to my MacBook Pro. When I connect the reader to the Thunderbolt display connected to my Mac (which has USB 2.0 interface) it works well. Erasing, formating, etc does not change anything. My other card readers (USB 2.0) work well on both interfaces.

Is there any help on the horizon ?