You are not alone, blogger is notorious for strange hiccups, but worse, they'll magically reappear sometime after you repost them. It's all very strange and arcane.
I wondered what happened. I could see the post in my blogger reading list, and then when I went to read more it said it could not be found.I assumed you deleted it for whatever reason. :S
Yes on the post disappear issue. Wish I had an answer for you on the why.