Abit NF7-S MB; Connecting USB printer disabled cardreader

[videobruce]

I tried to plug in a USB printer to the lower rear USB slot (of two) and it disconnected the memory card reader (4 drive letters) that is plugged into the on board USB2 plug. The USB1 onboard plug is plugged into a supplied rear panel bracket with both ports open. Two on the rear panel, and two each connector on the MB makes 6 doesn't it?

This is a Abit NF7-S v2 MB running 2k w/sp4