I had exactley the same problem. with me it helped to download 5.3 and then 5.4 and then the 5.4.1 patch
A question though, does the menu still have the same skin ( I mean the red with fighting people background) as it had in the vanilla game ?
If it still doesn't work, after you;ve installed the latest version , you should then uninstall RTR and install it over again.
PS : no I don't think it had anything to do with the saved games.
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