Audition 3 and the activation service
I haven't experienced this for myself, but apparently as of December 13th 2012 the activation service for Audition 3 and some other products has been disabled because of a security issue. So if you need to uninstall and reinstall Audition 3 you will have to follow the instructions on this page. [sept 2019 - Audition isn't available here any more - see below. This FAQ is only for reference now.]
It's important to note that the software you may have on a disk won't work any more - you have to use the version on the download page, and the serial number provided with it; no other combination will work.
If there are any other issues with this, please post comments on the appropriate forum.
Important update: Audition 3 isn't available any more. Upon advice from their legal team that we are not allowed to discuss the reasons for, Adobe have withdrawn any software downloads for almost all products other than the current version of them, or its -1.

