Alright..

1. I had already checked the texture before I posted. All is well.

2. Its not MED, for EVERY other model works fine.

And the most intriguing? It stoped....it works just fine now.
I just decided to try and continue, and close it less often. I continued texturing, and decided to export to 3ds, to try and reimport it. BUT, thats ALL I did. I just exported it, and tried to reopen my .MDL file..and it open without problem...I tried it again..and it worked again!

I didnt even really do anything, and its working again! I know I shouldnt complain, but there WAS womthing wrong with mdl..and it may happen to someone else, and they may not be so lucky..you know?