It seems you've managed to trigger our second-most-terrible bug.
Our best guess is that it's caused by a mischievous gremlin in the server room, but we're still investigating.
Workarounds: Try turning off your computer and turning it back on again. This usually fixes 99% of all issues.
Or, if you're feeling brave, try asking our team of highly trained professionals for help.
They'll be happy to assist you, but be warned: they're not responsible for any emotional trauma caused by our bugs.
For more information, see our FAQ
See also BUG 2-1-1: The Unrelated-but-Kind-Of-Similar-Bug and BUG 2-1-2: The Slightly More Terrible Bug