I have been playing X-COM APOCALYPSE with DosBox for over 2 years and have always used the ALT-ENTER shortcut to switch to fullscreen.

Today I was changing the framerate, CPU, and cycles values on v. 0.72 to try to get the game to run smoother (lagging video and audio). Well I finally get it running better, but then fullscreen stops working. I push alt-enter, the screen goes black then back to 1/4 screen.

I thought something I changed in the config file had cause this program, so I installed 0.73. Unfortunately, even with a completely new installation using default settings, the problem persists. I have not changed anything on my system today or run any programs during use that would have caused this problem to come on all of the sudden.

If anyone knows how I can address this problem, I would appreciate their help. Thank you.

Win XP Media Center Edition SP3
Intel core solo T1350 1.86GB
1GB Ram
ACPI Uniprocessor PC
ATI Mobility Radeon X1300