Have you checked with hardware acceleration disabled?
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I don't know where to write this proposal for better solution but i thing that Opera Mail developers should include some option to run/minimize Opera Mail to 'system tray' because right now I have open Opera Mail on my taskbar but I want minimize it to tray and only there see running in the background this mail client.
It would be cool to have this functionality now when Opera Mail is now a separate application (not included in browser)
And vertical panel with Bookmarks, mail, contacts, history, and many more was the best solution in web browser. Vertical panel can be hidden if necessary, everything was close at hand.
Please discuss about OLD and NEW bookmark functionality.
P.S. I like OLD solution and i'm still using Opera 12.17 on my computer, and check new Opera when will have full functionality. We have 13 versions ahead and maybe new Opera is faster and better manages memory but still does not have full functionality of the browser