Tracie, try going into the Event Manager (F2) and look for the "dvd popup" event under Skin>Autoplay. You can probably change that screen to your own screen that contains your personalized button for launching TT. Or, you can just leave that blank and see if it works.
I too am watching movies in 1920x1080i resolution with the help of a freeware screen-resolution changer app. Didn't like powerstrip since it was causing some problems plus did I mention that the program I 'm using is freeware?
Anyways, in Event Manager, under File Types, I assign a Start and End event for my Zoomplayer extensions. I point the Start event to the event batch file to change the resolutoin to 1080i and the End event to the 856x480 batch file. Works pretty well except I still see the dos box flash for a couple of seconds when the resolution changes. I think powerstrip has an application feature where it changes the resolution for a specified application on the fly - have you tried this first?
Ken, the only thing I can think of is that you probably started the skin in a high resolution in your Xp box instead of the 856x480 resolution. I am working on different resolutions for this skin so hopefully this problem would be avoided. Sorry for the inconvenience.