Is the Google Buzz rollout corrupting some Gmail accounts?

I was playing with Google Buzz last night. It wasn't available via my Gmail account directly but it worked on my iPod Touch.

Opening my Gmail this moring comes as quite a surprise. Rather than my mobile dabbling encouraging Buzz to appear... it looks as if key Gmail options - such as the ability to Compose emails - have been removed. There's a link called "More" but clicking on it does nothing.

This issue isn't related to just one browser. It's occurs in Chrome and two different versions of Firefox.

Is anyone else suffering?