Exactly the same things. If I don't attempt to Adjust Altitudes, SIDs, STARs and Holds, there is no problem. Nothing different there. My guess is that you're setting up a table(s) when you adjust the altitudes, etc and there is something about that process that is abending (is abending a mainframe term?

). But Dave has pretty much already said that. But why only certain flight plans? Is there something about the number of waypoints? I understand it works for you Dave, but still the size of the table may be an issue with my 'release' of the opsys. This 91 issue is the critical factor keeping me from easily using PF3. Dave, if at some time you want to jump on Skype and discuss (I can aim my camera at the screen so you can direct the action), am up for that. Might be better than this marathon thread. Just a thought.
Cheers,
George