SA2 doesnt appear to work on the MAC, in fact, even worse, it seems to screw up many of the extensions you may already have installed.
It's a bug with this release. Ray sorted out my Remove Cookie behaviour the other night after remoting to my machine and re-programming it for about 4 hours.
However, I've now been waiting since Saturday for someone to respond to the same problem I now have with the Show Validation Errors behaviour which has gone pear shaped since SA2 was installed.
I am now behind with my project thanks to this and getting more infuriated by the hour.
One can only assume, that for such a huge problem to have occured, that the extensions are not BETA tested on the MAC.