Do you have something like sweetim or smiley central installed? if yes, remove it, if no completely remove messenger plus! live (making sure scripts are removed as well) and then reinstall it, and install each script one at a time to see if a script is causing this to happen.
If is is due to a script, get in contact with the developer so they can come up with a solution.
Red Bull Racing Australia - Triple Eight Race Engineering - Holden
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