Mail.app freezes when Mail Preferences opened
Title says it all. I get the beachball in Mail and I have to force quit to continue using the app. Everything else in Mail works fine. I also tried opening Preferences in Contacts and they open as they should. I'm running OS X 10.8.5 on my 2011 15" MBP. What should I do?
15" MacBook Pro 2.4GHz Quad i7/8GB/750GB HDD and 120GB SSD Mountain Lion 10.8.5
Power Mac G5 DC 2.3GHz/2.5GB/250GB Leopard
Power Mac G5 DP 2.0Ghz/1GB/160GB Leopard
iMac G3 Blueberry 350MHz/1G/128GB Panther
iPhone 5 16GB iOS 7
iPod Touch 4Gen 32GB iOS 6