I have been working on an Air app in cs4. The version of Air is 1.5.
For some of the features in Air that would make things easyer for me, I need to upgrade.
So I downloaded cs6 to test out as it has Air 3.*
Problem I have found is that my project crashes the PC every time the compiler catch's an error. Any error.
My system stats are : XP Prp 32bit sp3 with 3GB ram and all the latest updates.
This doesn't appear to be an AS3 issue, but moreso something related to the software/system. You should try reposting in the Flash Pro General Forum since there are a couple of Adobe employees showing up there recently since CS6 started showing signs of problems.
Maybe you can send one (or more) of them a private message to help expedite getting their attention. Just look for posting regarding CS6 and you should find the employees involved in one or more of them.