I added TONS of AI Traffic Plans, and now the AI keeps getting told off for being too low, and then their IFR flights are cancelled by ATC. What is going on, and how can I fix it?I am using FS2002, and of course, lots of tools/utilities to modify things.

Are you using real world weather during the flight? This might be the cause as I understand AI traffic cannot adjust their altimeter. Try flying with standard weather.japangg

I don't use real world weather, as I, well, can't be bothered!

It has to do with the altimeter setting, I think, if you use a weather theme such as "Gathering Storms" or whatever it's called which has an altimeter setting of 2921, I believe, the AI aircraft will be off their altitude and be continuously fussed at. Try restting the altimeter in weather settings to 2992. JamesJ