OverlordQ's Journal: Google Disables IMAP?

I don't know how many of you have checked your GMail this morning, but having pulled an all-nighter again, I got a rather strange notice in Thunderbird saying my account was not enabled for IMAP, or something to that nature. Upon logging into GMail's web-interface, I noticed in the Settings page "Forwarding and POP/IMAP" has reverted back to "Forwarding and POP" again. Is this permanent, or just a temporary change by Google?

Edit: Strangest one-off bug, signed out, then signed back in again, and the setting is back.