My Macbook Pro application Messages (or iMessages) seems broken. It stopped working after I messaged someone with huge amounts of question marks whilst they did the same to me.
Obviously it was a stupid idea, but now I'm looking for a way to fix it. When I try to open the app, it does nothing, and the light-blue light comes on underneath it to say that it's running. Right-click offers "Application Not Responding", "Options", "Show All Windows, Hide, Force Quit".
Any help appreciated! :-)