I'm having some trouble with Apple Mail 6.3 (1503) and Smart Mailboxes under 10.8.3. When I create Smart Mailboxes they work just as one would expect them to. When I quit Mail and re-open it, they're gone as if I would have never created them. I found a similar issue with an earlier version of Mac OS X where deleting the
~/Library/Mail/ fixed the problem. This does not seem to apply for OS X's current version anymore.
I filed a bug about this: http://openradar.appspot.com/13700673
This happens on both my MacBook Air and my iMac. Both are running OS X's latest version.
Anyone know how to fix this?