Mouse problem through KVM switch (SuSE 8.1)

Hello I cannot get my mouse to work properly through my Linksys 4-port PS/2 KVM switch. If I login as root, the mouse jumps everywhere and opens up everything anywhere just by moving it. When I login as a normal user, the cursor does not move at all. If I connect directly to the PS/2 port (bypassing the KVM switch), everything's OK. The other computers (a SPARC and a couple of Windows boxes) have no trouble. If I boot Windows instead, there's no trouble either. Any ideas? Thanks