Whoops, I just posted that I'm having the same problem. (Then I saw this thread.)
Copy of what I said on the other thread:
I don't see the "my craftster" link (the one in the yellow tape measure) on most pages anymore. I don't see it when posting a new topic, I don't see it when I'm in my personal messages and I don't see it when I'm on my bookmarks. I DO see it when I'm browsing the main community page or random topics.
WITH - Taken on Community Home Page
(Articles -> My Craftster -> Calendar)
WITHOUT - Taken on My Bookmarks Page
(Articles -> Calendar -> City Guides)
Er, is this just me?
FYI: I'm at work on Firefox 3.0.13 and all the stuff clears each time I close so there are no old cookies or anything.