Is there any way of opening sessions created in previous versions of Audition (.ses files) as I can't see how to open them in Audition for Mac?
No, Audition for Mac uses a new session file format .sesx because the software has been totally rewritten and .ses files can't be compatible. However if you saved your previous AA sessions as .xml, as you can in AA 3, then these can be opened in the new Audition but not all the effects will necessarily work exactly as before.
See this thread http://forums.adobe.com/thread/750872?tstart=0
Message was edited by: ryclark