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It appears as though the bubbles containing the favourite/ignored topics are missing a side:
Is this a new bug in rev 2011.5.9.4?
Edit: I'm using Chrome 12.0.742.30 dev. Works in Safari.
Chrome 12.0.742.30 dev
It's always been this way in Chrome -- doesn't happen in IE9, FF4, Opera, etc.
So it's really a chrome quirk.