Same problem here, blank icon browser. Tested with a fresh user profile
and the problem does not occur.
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Cannot change application icon on Karmic beta
https://bugs.launchpad.net/bugs/448447
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I updated also from 9.04 to 9.10 Beta yesterday. I had the same issues
with the Firefox fonts. I tested with a fresh user profile and it works
correctly. After reading Jeans note, I deleted my ~/.fonts.conf,
restarted my Gnome session and viola my Firefox looks like it should be.
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[jaunty] Fire