[Solved] Suddenly I cannot fold forum groups

Something has happened in the last few minutes to the site and all the forum groups are unfolded without the ability to fold them any more.

EDIT:
I have tried this with Chrome and FireFox and problem present on both.

Must just be you. Still works for me. I'm using FireFox - the version wouldn't make any sense, since its an ESR version.

PaulS:
Must just be you. Still works for me. I’m using FireFox - the version wouldn’t make any sense, since its an ESR version.

Must be some fubar thing IT have just implemented at work.

Turns out ajax.googleapis.com scripts were being blocked.