Not a problem for me. My USB ports are arranged differently from yours but then we don't have exactly the same hardware.
There have been several different posts about failure to be able to use some USB patterns. The underlying problem seems to be enough power available when a gadget draws power from the socket into which it is put!
Your printer presumably has its own power supply, and so may the scanner, but the BB modem almost certainly zaps the USB bus for quite a lot of watts.
A simple way out might be to buy a powered USB2 hub, then you can add still more peripherals!