Any errors in the error console?
Last good nightly: 2011-04-11 First bad nightly: 2011-04-12 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=09b605eb3e0d&tochange=a174b86200d6 BZ, is this similar/related to Bug 666985/Bug 666604?
6 years ago
Fixed by changes in bug 666604.
Setting resolution to Verified Fixed on Mozilla/5.0 (Windows NT 6.1; rv:7.0a2) Gecko/20110706 Firefox/7.0a2