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Download Opera browser with:
Have you set up operas download folder and is it valid ?
try dev tools see if any errors in the log window
Those links refer to Opera Mail and old Opera Presto
I don't know a way to disable that message.
Opera should explain the way they Sync and how to use the same Speeddial.
I agree that it was a mistake to remove the content stylesheet that Presto Opera had. Now I have to use an extension to apply a stylesheet to web pages.
Since some sites have only HTTP pages, blocking those would not be a good idea.
Why would anyone want to hide bookmark folder icons?