It has happened to me as well. I typed a somewhat lengthy post, only to have it not show up. I then typed "this is a test" -- a very short post -- and it showed up fine, but when I tried replacing that with the post I really wanted to put up, it was blank again. Copy/paste of my original text (which I had saved in a Word file) also came up blank.

I finally got it to work by retyping the first paragraph, saving it, then typing the next paragraph and saving it, and so on until the post was complete. I was using the Chrome browser (v. 29.0.1547.62) on a MacBook Air -- also tried it from my iPad, with the same result (blank post).

Now we'll see if THIS post works! (Edited: It did!)