We had a similar issue with the 2960's and found out they don't do IGMP snooping at layer 3 which is what they are getting from the 7200. We had to go to a layer 3 device to do the pruning.
I have a KVM switch with PS2 interfaces and I could never get it to work on a USB keyboard or mouse with USB adapters. Let me know if you come up with anything.