I don't think there ever was a fix for the graphic errors you describe. See this thread for a full discussion.
As for the 'missions,' there were combat missions in FirePower for CFS3, many of them based on the historical missions of the Memphis Belle; and there were some modern day city-to-city flights in Heavy Bombers & Jets for FS2004. When the original Heavy Bombers & Jets product was released, there was no FSX. The FSX versions on Aircraft Power Pack are really just the old FS2004 versions with a few updates, and they were made compatible with the original version of FSX before Microsoft released service packs 1 and 2, and Acceleration.
The civilian flights from FS2004 were not made compatible for FSX, and the combat missions from FirePower never were in Heavy Bombers & Jets to begin with.
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