My AI Traffic does not climb above 9500ft. It used to. The aircraft disappear when it goes beyond that certain altitude. Ever since adding MRAI flightplans, I think this is when this problem started. I have since removed them but it is still the same. I use Traffic 2004 and I have also uninstalled and reinstalled the program but the same happens. None of my flightplans are set this way as they all have flighlevels such as "310, 280, 350" etc.

Please can you help me as I miss having high altitude ai traffic. Thanks.

I would suggest that you remove all of your traffic files from your system and start from scratch. If you were using default traffic you can find that file on disk 1 I beleive. Then you will have to reinstall any other traffic files you had.
This is the only way you can be sure that the problem goes away just removing the program more than likely did not undo any changes it made to your traffic files.
Traffic files can be found in the World Scenery/Scenery folder usually toward the end of the file.
If you are lucky the program that you installed made a backup copy of the orignal files first. If so just rename them and delet the other one. 8)