I just bought this game (Blood 1) and when I run it half the screen is missing (the right half) and it is locked in 320x200 mode and cannot be changed. I cannot play the game at all as it is without being able to see half the screen. Has anyone else had this problem?

EDIT: I just noticed that DosBox itself comes up the same way (with the right portion of the screen black) when I run Blood: One Unit Whole Blood. Note that I don't mean the text is squashed, I mean I cannot read anything on the right side of the screen. Other games I purchased from GOG work fine.

EDIT 2: I got the game to run by running it from inside another copy of DosBox I have so the problem was not with the game but with the version of DosBox with it.