Dual Monitors and Child Windows off screen

Archived from groups: microsoft.public.windowsxp.help_and_support (More info?)

I have a dual head system. I have ATI Radeon 9600SE AGP and 7000 PCI cards.
My problem is, when opening any application or any child windows in said
application, the window moves offscreen to the left of my primary display.
Fortunatly, the ATI software context menu lets me "Move to Monitor X" from
the taskbar. Of course, no matter which monitor I pick, it moves to monitor
1. All child windows open off screen and dialog boxes DO NOT. I'm running XP
Pro SP2. I also have Hydavision installed for extended Multimonitor
functionality that ATI's software does not have. I uninstalled Hydravision
and it did not correct the problem. The problem started well after I
installed Hydravision. It was spontaneous and seemingly unrelated to anything
I had installed/configured.

Anyone have any ideas?