Search engines' icons on Omnibar not showing

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http://www.linuxquestions.org – I have Ubuntu 10.10 64-bit with Firefox 3.6.10 with the Omnibar add-on enabled. When I click on the current search engine's icon to display all my search engines so I can choose another one, the list of my search engines appears but not their icons and other people with the same OS and browser say they don't have this issue. What might be the reason for it? (HowTos)