Since you've done the 'Reset all settings' I don't think this will work, but might be worth trying - Tools>Privacy>Clean trace, then clear Cookies and Cache.
Alternatively, it might be a setting within Yahoo mail, although I can't understand how it would work in a different browser though, but might be worth checking. So click the gear icon in top right corner>Mail options>General, and at the bottom is something called 'Switch now' - it should be set to 'Full featured' and not 'Basic.' If those options aren't available in what you've got - which sounds like the old 'Classic' version, have a look at the bottom of the page and see if there is an option there - I've a feeling there used to be.
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