I was going to comment on Neil's status but I don't know how to do it. I click on the Comment link and it does nothing. Weirdly I can only see the Comment link on a few pages, mostly there is no hyperlink.
Do you mean comment on the recent activity list, rather than in the profile pages?
If you are talking about the recent activity list, I also, have had this problem, but it seems to work if you go to the home page and then click on the comment/lick button under each post.
Let me know if you still can't work it out.
Neil