What the heck happened with signatures since last night? There's a heap of complaints on [[en:WP:VPT]] from people with complicated, and indeed not-so-complicated, signatures, which suddenly stopped resolving properly.

My sig is fairly simple: up to a few minutes ago it was non-raw, and consisted of "Phil]] | [[User talk:Phil Boswell|Talk", which when wrapped with the traditional "[[User:..." and "]]" worked fine. I have now converted it to raw and filled in the supposedly automatic bits by hand.

As far as I can tell, the pipe and "[[" symbols after the "]]" were being converted into numeric HTML entities.

Is this some feature which has blown up in our faces, or has somebody been fiddling with code, or what?