I have just started working with AGS but I have a problem, when I import a background and play the game, it goes flashing and the background isn't completely on the screen. The resolution of both the game and the background are 320x200, and the background is made with MSPaint. I hope someone will be able to help me out.
It sounds like you haven't replaced the room's background but instead added a second one. AGS supports up to five backgrounds per room for background animations.
Instead of opening the dropdown list and clicking "import new background", you're supposed to click on the "Change..." button next to it.
Just select the second background, click "Delete", then replace the first one.
Thanks, that worked!