Whenever I play a game in DOSBox, there is a black, rectangular void running up and down the screen on the left side, as if the actual game display is too small. To visualize what I see, imagine a Daggerfall screenshot with a one inch bar on the left side.

Also, when I maximize DOSBox to fullscreen, I can barely see what I am typing because DOSBox appears to be stretched off-screen a bit.

Anyone know what causes these types of problems? Thanks.

Look at your resolution settings in your dosbox.conf file. Your resolution may be set to an odd setting. Also, whatever "aspect correction" or whatever is set to, try swapping it.