Audible changes in volume after reloading a project

I reload a project. Or reopen a project after Windows7 x64 reboot. And audiotracks start to sound louder sometimes. I have to reboot my computer again to fix this problem. My tracks are linked inthis project. There are no VCAs. Aweful problem. Can you imaging what I have to say to my clients? ‘I’m sorry but I can’t handle volumes in your mix?’ Steinberg, do something! I use 32bit version of 8.5