There's only a couple of action steps that might be affected by dual monitors. Can you tell me which test steps are having trouble? If it's a drag & drop operation you can manually tweak the window position by adjusting the WindowX and WindowY properties as shown in the attached screen shot. Test Studio will move the top & left sides of the window to these coordinates in order to precisely copy the drag & drop operation. It records what the window position was at when the drag & drop was recorded. If you positioned the window on the second monitor then Test Studio will try to put the browser window back on the second monitor.
I hope this helps.
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