i'm a beta tester and mail in combination with anything safari is completely fucked up:
copying/pasting a url
also, clicking on any active link (url/email) in mail).
mail generates a blank email for a fraction of a second, then app crashes. then mail stops working altogether%u2014anything having to do with generating a new email. i usually have to restart to get mail to work.
this is the only part of the os that is wonky for me.