We do have limits on the number of posts that a user can publish within a specific amount of time (to discourage spammers), but looking at your activity for the day, you're nowhere near it. It may have something to do with the most recent site update. I'll have to kick this over to mgaulin as he's the tech guy.
- Chris
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Off to take on other challenges. Good luck everybody! See you around the Interwebs.