This reftest, which is part of /tests/layout/base/tests/test_reftests_with_caret.html, fails consistently on Win 7 opt. It currently does not show up in TBPL, because the test is being skipped due to bug 678420. I'm going to comment out this test (and a few others), so I can land the fix for bug 678420. Meanwhile, some tinderbox logs exist for this failure while the patch for bug 678420 was temporarily landed: http://tinderbox.mozilla.org/showlog.cgi?log=Firefox/1313649994.1313650475.31268.gz http://tinderbox.mozilla.org/showlog.cgi?log=Firefox/1313640699.1313641152.965.gz

Also happens less often on win7 debug: http://tbpl.allizom.org/php/getParsedLog.php?id=6010861#error2