Phew - brilliant. I've just chucked a message to Kovid, but I suspect the only long term fix to stop more users having this nasty issue over time is for me to change all my plugins. And for others like meme, user_none and kpw who have all based code on my plugins to do the same workaround.
I wanted to get you up and running asap to confirm there was nothing else going on which is great. So we have a confirmed workaround while we figure out what to do next