active window switches monitors



New Member
Dual monitor set up. User is working in secondary monitor on right. It's a web-based program (if that matters). Randomly the window will switch itself to the primary monitor. It's not the same action every time that switches the window. She's been working fine this way all week, so it has just started this afternoon. If she moves that window to the primary monitor, it works fine.

I've checked all of the cables.

Any thoughts?