Please be careful what you say. It wasn't a force first of all. It's really the only option. Theora is a free to use, non-GPL protected format, and it isn't all that poorly supported. It's just not as big as Xvid because no one uses it to make illegal movie rips. The move is to ensure a free, non-license violating codebase is used for movie support, as opposed to the proprietary one used to play the MVE files. It's even more poorly supported than Theora is, since it's only in a handful of games. Most people seem to be able to get theora converting to work ok, so odds are something was done wrong at some step. I'd doublecheck what was done to convert it, and maybe post a few more details here so someone can offer some more insight.