Fedora 18 Alpha blocker bug, as per http://fedoraproject.org/wiki/BugZappers/HouseKeeping/Trackers
To propose a bug as blocking the Fedora 18 Alpha release, mark it as blocking this bug. It will be reviewed per https://fedoraproject.org/wiki/QA:SOP_blocker_bug_process . To propose a bug as 'nice-to-have' for the Alpha release - allowing a fix to go through the Alpha freeze, but not blocking the release - mark it as blocking the bug F18Alpha-accepted . See https://fedoraproject.org/wiki/QA:SOP_nth_bug_process for the NTH process.
If you do not have the necessary privileges to mark a bug as blocking another bug, contact a member of the Fedora QA team via IRC or the 'test' mailing list, and we will do it for you.
F18 Alpha is out, closing.