@Anti: You sure it was a mob? It could be someone with that immortality bug who was pushing you. For example Nukl has this bug, but it's not him because he's not invisible.
This occurred to me after we kept getting pushed off at seemingly perfect times, however:
-At one point Simpson was pushed off of my structure, and I was at another end of the structure that would take a good 30 seconds to get to, yet I was pushed off maybe 5-10 seconds after he was. I don't see how this could be a player, or even a normal mob, unless the player used /home or something.
- When Simpson was pushed off and died, he dropped all his items, and I was able to recover pretty much everything, except for some glass. Why didn't this player try to steal the items?
The only person I recall being on at that time was Nukl, but fanner said he isn't invisible.
I suppose that if anything is stolen in the coming days from my secret stash that only SimpsonFly and I know the location of, we will have our answer, because if it was an invisible player he would have seen it when we went in there.