I've got the exact same issue. I've seen the 'patch' suggestion/solution, but mine is patched to 2.601 - I re-downloaded the patch and tried installing but got a 'patch already installed' error code. I also tried reinstalling the mod and playing the game before and with each update, but nada.
Anyone got a real fix for this? Do I need to reinstall the game proper, patch it and reinstall Eastern Front too?
I'd like to confirm if reinstallation is necessary because the game takes like 30mins to install! : / ...and that's not including downloading and installing all the updates! (*Presuming you have to re-download/install them that is.)