Elorian;
Do you have your Caps Lock key enabled? That or holding down the Shift key lets you move the screen focus away from the character, but can result in the screen not following the character entering hatches/caves or using ladders/stairs. Normally this means the screen stays at the previous area, rather than being black, though. If you do not have the Caps Lock key enabled, you could try holding down the shift key and bumping the edge of the screen, then releasing the shift key to see if that will recentre the screen on your character (still a pain, but better than save/reload).
Here is a link for the
patch, if you need it. There are
download managers that can help you get the patch as quickly as possible. Even on a 28.8 modem, it shouldn't take more than a couple hours to get the patch.
Tempo;
Some of the versions of DD that came with BD were already patched, and some were not (presumably they finished off whatever original CDs they had before starting with the updated version).
Re-installing the patch should not cause any problems.