Most USB cables should be shielded anyway, so interference won't be the issue. However, believe it or not, the cable's shielding could be
![[Image: msn_tongue.gif]](http://shoutbox.menthix.net/images/smilies/msn_tongue.gif)
for exactly the same reason the current flow in the cable won't be interfering.
Basically, the shielding could be soaking up the RF from the mouse.