Thanks for your responses but cyberspace only made them available to me for the first time today. I thought that very odd since you guys are usually on the ball very quickly (RAF 7 minutes), the last time I looked I'd had 22 views but no responses. Since I thought no one on the forum was going to respond I sent a help request to railmaster support. They responded in lightning quick time with the same advice that you have given me and which I already knew but was not able to make happen. Here's what happened next - I went back into railmaster but no matter how hard I looked I couldn't see any window to set the screen size on the main screen. I was going to send a screen shot of my screen and just by chance the cursor touched the floating touch screen button and low and behold a bit of the screen size window appeared. I previously had shut down and restarted railmaster several times because I was pretty sure that there was a window there even though I had not had any reason to use it for a number of years. The only thing I can take from this experience was that the floating button was constantly re-docking on top of the screen size window instead of in what I see is it's default position just below it. Perhaps you could file this away in the memory bank in case anyone else gets caught with this strange quirk. Thanks again