I'm sorry your having issues with the blackberry messenger application. Let's work together and get this fixed!
Please power down and remove and reinsert the battery and retest. Have you deleted the application and readded? Are you able to receive normal text messages?
Please let me know so we can get this addressed
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As Joe mentioned, try a battery pull and also uninstall and reinstall BBM.
Once in a while you may have to update your BB ID, but in my experience, you get a message and all it requires is a simple click.
Let us know if any of these work for you.
EDIT: I see you fixed it. Thanks for the update.