i run OB on two monitors without to many problems.
have you tried having two seperate desktops, one per monitor? does this help?
how many OB bars are you using?
i have two, one docked on the bottom of my primary monitor (mazimised windows work fine) and one docked to the top of my secondary monitor. maximized windows dont work with this one
as for WB crashing, have you tried the latest nvidia drivers?
failing that, have you tried some older ones, say 23.11 (i think). i can run the 23 version drivers fine, but when i tried more recent ones my home winXP machine kept on locking up, even without WB running