I think this could be really a reason for the crash. Version 3.0 creates a "strat_models" file in addition to the already existing model_strat-file. After installing Version 3.0 the game crashed whilelaunching a new campaign. Solutio was to copy the contents of the "stat_models" file, paste it into the "models_strat"-file and then delete the "strat_models"-file. Now ec´verything seems to work fine.