I went into MyMumsnet to change my email preferences, and on clicking "logout" got the following:
Not Found The requested URL /MemberPage was not found on this server.
On checking again, I had been logged out and my email preferences changes had worked. That was on my desktop, but I get the same on my laptop. Browser is Firefox - 4.0.1 on my laptop, dunno what version's on my desktop 'cos I'm too comfy on my sofa to go and power it up.
BTW, didn't there used to be a Site Tech topic? It's not listed on the A-Z as far as I can see.