mdl to mdx converter and back?

i have been looking around the internet for sometime for something like this and all i found was yobguls which doesn't even work for me so i can't convert my mdl's to mdx..can anyone help me here?

NOTHING other than yobguls. Sorry.

There's an extremely long thread someplace in the forums (you'll probably need to use the search page to find it) that deals extensively with problems running yobguls' converter. The program is extremely finicky, and almost nobody gets it to work initially, but eventually almost everyone does. I can almost guarantee that that thread will be able to solve whatever issue you have.