I've got the USB version of the guns and they have been working great.
However, I recently added a wireless mouse to my pc and had to shuffle the various USB connections on my pc (including both ACT lab guns) to make room for the mouse's USB wireless receiver. Just discovered that now the guns don't reload.
The only thing that has changed is the guns are plugged into different usb ports on the back of my PC. I can't remember for sure which ports they were in before I added the mouse, and I've tried a few different ones with the same result: I can get them to shoot but not reload (using Area51 as a test).
Any advice?