Hi, chiming in here from the dev front so feel free to remove this post if you want to, but I've got a suggestion to throw out there.
If you have any other freelancer installs solely for modding or whatever, I suggest you back them up (zip file or something) and remove their directories as well. Purge every instance of Freelancer from your computer, not just the multiplayer copy, and then give things a shot.
You may also want to try using something like file assassin to remove anything (if anything is) left in your Freelancer directory(ies) post uninstall, as uninstallers sometimes leave config files and such behind.
