Ok, so I renamed my theme directory, went into the wp-admin dashboard, polylang was no longer activated (maybe as I’d been messing about trying to fix it) I clicked activate and then could see my site in the twenty eleven theme. I then renamed my theme back and re-activated it, and bang all sorted? @philzzz hopefully this happens for you too.
As a follow up, I found that if I rename the folder containing my theme, WordPress falls back to a default and it is working, so there must be a conflict between my theme and the updated plugin?
Any help on tracking this down would be appreciated. My theme is a child theme of twenty eleven.
I’ve just made the same mistake. Clicked update, and now error 500!
Help please!