Did you complete all the quests in the Guild? Because if you do, I don't think you will be able to play after the credits end, I think. I did manage to continue playing the game after the end of the credits but that's most probably due to some of the unsolved quests still left at the Guild. It's just a hunch on my part so I may or may not be correct here.
P.S. Welcome to the forums, iceboy. 
__________________ "Every time I hear a person saying, 'PC games are dying,' or 'PC games are dead,' particularly if they're a competitor, I fully agree with them--and I encourage them to get out of the space as soon as possible, just so I don't have to compete with them," -Tim Holman, Senior Producer for Company of Heroes
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