Just wanted to bring some wider attention to this issue:
https://bugzilla.redhat.com/show_bug.cgi?id=688302
I filed it a while back but the maintainer doesn't seem very responsive. It seems krb5-auth-dialog has some kind of bug which causes it to notify you that your credentials 'have expired' even if you don't have any. krb5-auth-dialog isn't installed by default in F15 but it *was* in previous releases, so anyone who upgrades from F13 or F14 to F15 is going to see this; it results in a persistent notification in the Shell which you can't really get rid of, short of removing the package manually.
I imagine it shouldn't be too hard to fix, but the maintainer hasn't responded at all yet.
Thanks!
desktop@lists.fedoraproject.org