Mouse Without Borders Gets Stuck

Question

I've been using Mouse Without Borders for a few months now between 2 PCs and a notebook, all running Windows 7 Home Premium. Never had any problems. But after my ISP put in a new cable modem (don't know why this would matter) I have something really odd happening. 

I have a pair of Logitech M570 trackballs. One is connected to System 1, and the other is connected to System 2. Normally I can move the mouse between these 2 PCs (and onto the notebook as well) without a problem. But now, the mouse on System 1 moves onto System 2 and then gets "trapped" between the borders of its dual displays, and can't move back to System 1's triple displays. The only way I can make System 1's mouse pointer move back to itws displays is to move the pointer on System 2's display with its own trackball, back onto System 1's display. System 2's trackball has full reign over any of the 3 computers. But System 1's trackball (which used to have the same reign over all computers) always gets trapped on System 2's display.

Any idea how to fix this? I tried running the setup process all over again on all 3 PCs, but the problem remains.

Answer 1

Rebooting System 1 seems to have solved the problem.