This has probably been posted but here it is again.
Deep Twatwaffel douchedrinkers doinked the system in protest to the hearings and reset daily limit. On one acct I hadn't tweeted from in weeks - same BS.
A work around I and many others successfully used was to schedule your tweet for a few minutes in the future using their convenient time clock.
It appears it is now 'fixed' - 615pm EST.
IF it happens again try to use the schedule tweet function.