Hi,
I've run into some problems concerning video too. I have two systems, a xp sp3 pc with CRT monitor and a vista (no sp yet) notebook with 1280x800 as native resolution.
I run DOSBox from my USB drive using D-Fend reloaded. On both systems I've encountered video problems, quite different ones though. Obviously (USB), I use the exact same settings on both systems.
The XP system runs almost all of the games nicely but a few screw up in fullscreen mode. I'm using the surface renderer (yet to test to others thoroughly to be honest) and these games have quite a peculiar problem. When the picture changes in the game (like switching menu), the screen often fills black and only the areas I move my mouse over show the true picture. Basically, I can whipe the black surface away with my mouse like dust with a towel. Like I said, this only happens in fullscreen mode. (no scaling, no double buffering, no aspect correction, orginal resolution). Examples are Police Quest 1 VGA and A320 Airbus.
On my Vista system the problem is quite worse 😒 Everything works fine in windowed mode. When I go fullscreen though. the picture remains the same, just with a black background. It doesn't get stretched to fill the screen at all. I searched for this problem and found topics mention it, without a clear solution though. I tried every combination of renderer, resolution, scaler and other things I could think off, but the problem remains. I even tried a 0x0 resolution I read about in some topic on here?! No effect, the picture remains as tiny as before.
Now, you could argue I should just use the scalers. But that's a) no fix, just a hack b) against my principle not to use scalers and c) would mess up my universal settings for both systems
Also, not really related, why do all screenshots I make NOT look like the actual picture?! I can upload examples but basically it seems like the pics use less colors or something like that, creating less defined areas in the picture!? I guess I have to upload some to show what I mean 😉