I also had the same error message. All I was using was correct punctuation as needed for the subject, in the end I got tired of it, so didn't bother posting, which means some one lost out on the positivity I was on with.
The all-caps checker was updated to allow more all-caps words in your message if the message was long. Specifically it checks for a percentage of all-caps words now instead of an absolute number, which should allow a bit more flexibility. But in making this change I introduced a bug bug where *any* word with one cap was treated as an all-caps word. That's been fixed, but as always things are always being tweaked... sorry about that