How long has it been trying to post? If it's over 20 minutes it probably won't post anymore. I'm not sure what causes that...not your token though. You could cancel the scheduled posting and re-post. That usually takes care of it.
We're having the same problem today. It's been over a half hour since we first got the message "posting". Tried to cancel but it wouldn't let me do that. Now what? Any ideas?
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