Fastmail broken for me :(

[pne]

How annoying. I changed the default charset to iso-8859-8 to send a message containing some Hebrew text, and now form submission buttons don't work any more—I simply get booted back to the Mailbox screen, and the action is not performed. That's only a minor annoyance if it's the Format button that's broken, but when it's the Send button, or the Submit Support Request one, that's really annoying.