Thank you! I'm glad I'm not the only one. I've been double-posting for a few days now, and thought I was having a finger twitch problem.
It happens to me when I do a ‘post’, and I get a blank page.
My statusbar indicates DONE.
I backpage, and hit post again.
Double posts!
So the next time, I didn’t hit post again, and found it had posted once.
Aha.
Then, I posted, got a blank page, skipped hitting post again, and found no post at all.
Quirky bug, whatever it is.