This just happened to me too, as soon as I hit the post button, gone! I had most of my work saved in notepad, but the changes I made on the post screen were gone for good. Steemit has been locking up on and off for me all day. And I was pissed, after spending 1.5 hours fine tuning the post, it vanished into a black hole!

And a side note, I rewrote the changes in notepad and pasted in the text, and wow another lock up when I was assigning categories, and those got screwed up too. Who ever heard of politcs? LOL And well, it won't let me fix that one... What a day! Good luck on future posts!

Have a great night. :-)