HIGH PITCH SQEAL IN MY RENDORED PROJECTS! NEED HELP!!!!

[danny2sday]

So lately when i have rendored my projects they have been coming out with a really high pitch sqeal and not all the tracks are present in the mix! I have been using Live for 4 years now, and it just started doing this! The only way to get rid of it is by "normalizing" my rendoring! Does anyone have any idea what in the world is causing this problem? I have people waiting on songs, and need to get this fixed ASAP! Thanks to anyone that can help me with this headache!!!!

[schnerg]

are any of your fx or mastering plugins trial versions that are now expired? Maybe they were good when you inserted them and are now expired?
Just a guess.