Well.. then I guess that's the problem... I'm using MGE rev 178....
I'm not using MWE cuz like a year ago I indeed had the same thing cuz off MWE...
All righty, it's good news/bad news time.
Good news: reverting to the latest stable build of MGE *should* stop your game from crashing like a Russian spacecraft on re-entry.
Bad news: I seem to recall having to do a total uninstall/reinstall of Morrowind to clear the beta MGE. I'm pretty sure that it stores something in the registry (MGE, that is) which can only be undone by removing it manually - or, at least that was my experience with it. You may need to ask in the MGE thread on that one.