On more than one occasion I have written a post only see it vanish into the deep cavern of cyber-blackness (ie, it gets deleted and I lose it).  I have learned the lesson to never click on the Preview tab and then back to the Write tab.  The text never repopulates the writing pane and stays grayed out forever.  And my post that I just wrote?  It vanishes completely.  I could simply copy-and-paste all the text before going to the Preview tab, but what's the point?  I'm going to lose all the text anyways so I just quickly look over what I have written and then hit Publish.