I think twas a hack, but I think not in back
Given that the vandalism is limited only to ER's posts, it's not likely a hack on the Zone, but on ER's computer. Probably, but I'm still investigating.
I feel kind of silly not noticing they were all ER's posts. Thanks, RL. I wrote podrock a quick email, asking him to change his password, but now I think that was unnecessary. Oh well, it's a good idea on principle, from time to time; good I was forced to change mine.