I used dual screen for years and never had that. You should probably try to work out why it happens rather then mask it with other software since it's not normal. What games does it happen in?
It's happened in every single game I've ever played.
Diablo 3 with it's confine cursor to primary monitor is the only game that has properly locked itself to my main screen. Literally every other game allows the cursor to just float on over to the 2nd monitor and alt-tabs me during gameplay.
I've tried switching my 2nd monitor to one with DVI instead of HDMI, and even used a stupid Serial cable and it does the same thing.
I've even reinstalled Win7 trying to fix it and I'm totally out of ideas.
I've never been this baffled by anything in my life!!
The module that does the cursor lock is called SwapScreen and the option is contained in the hotkeys section. It supports Starting when Windows Starts up, and you can set whether the screen is locked or unlocked when Windows starts as well.
Thank you killer_939 for showing interest in my problem. I appreciate it!
Now to go do my victory dance!
:Edit: This prog even has a sticky cursor feature that does what the other programs claimed to be mouse lock.