Is Your Topic Lost in a Black Hole on Physicsforums?

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How does a topic fall into a black hole on the physicsforums? Someone posted a new question about finding a book, I gave a response and upon sending the message, physicsforums said the topic was in a black hole. What is this?
 
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The thread was probably deleted between the time you started typing and the time you posted.
 
It's just trying to be a clever way to present a 404 not found server message, nothing more :smile:
 

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