Well you shouldn't have to freeze anything in order for an export to work properly, provided your pc is reasonably up to date and not hopelessly underpowered.
Listing your system specs in your signature is a good idea because you'll be asked this time & time again.
You also need to be mindful of your bussing structure
In essence, all tracks should go to a bus, and all busses should go to your Master Buss (which YOU have to insert), finally your Master Buss should go to your Soundcard/Main Outs.
Once this is in place, your export should sound exactly the same as your project.
One way to test is to import your export back into the project. Solo it, and route it straight to your Main Outs (otherwise you'll be doubling up the effect of any Master Buss processing)
Export @ 32 bit, 44.1KHz with NO dithering