I apologize for the issues you have experienced. Quick question: after you adjusted the Screen Resolution in Settings, did you also adjust it under the Viewers tab on the right side of the program? When you adjust it in the Settings, that is for future Scripts. If you have anything built, you would need to adjust it under the Layers tab on the right.
Let me know if that's what you have already done.
Tell me more about the switch between dual and triple monitor setup.. In the bottom right corner of MediaShout 7, you can click the M Monitor to turn on the Main Screen or the S Monitor to turn on the Stage Screen. is this what you are looking for?
Let me know more about your situation and I'd be happy to help!