OK, first thing - Morrowblivion is amazing. I love Morrowind, but getting it to run isn't easy now, plus the graphics are pretty clunky these days. The amount of work that must have gone into Morrowblivion is unbelievable, and I'm astonished by just how well it runs.
So far I've only run into one issue, but it's a pretty annoying one: most of the traders won't buy or sell. When I select that option, the trader's lips move as if they're saying something, but no dialog appears and the buy/sell screen doesn't pop up. It's a real nuisance - can anyone offer a solution?
EDIT: The game also crashes periodically, apparently at random.

Do you have subtitles turned
Do you have subtitles turned on in your game? Also some people won't trade with you unless you're in the same faction or they like you enough.