Try joining a server agian via the method I showed you up there and paste the results.
Screenshot would be better if you can.
Edit: From reading the thread agian, it seems like you have some kind of file hiding somewhere that needs to be removed or replaced. It should just be a re download of the latest launcher and have it do an integrity check. I am not sure what else could be the problem, if you played this game x amount of years via from going to a folder. Chances are its messy and unorganized from other mods you played and it could be interfering with MB2.
What you could do is make another folder, and copy game into that new folder from a fresh download.
And by fresh download I mean download Jedi knight academy again, and put it in that new folder.
(make sure you update the base game before doing this) and install the new movie battles into that folder instead of the main one you have. Then play the game via the new folder.