Off=topic, but it's a bug in the version of Chromium currently used in Opera stable. (Do not reply here, as it is off-topic to this thread.)

Seems to have two different titles printed one over the other ... is it only when the tab isn't focused?

You can't; Turbo has been dropped.

You don't need an extension.

If you navigate to some webmail site, the site will tell Opera that it can handle mailto links so Opera will ask if you want to use that site as your mail client. If you say No, then you will continue to use whatever is your default mail client.

If you go to Default Programs in the Control Panel, you can see what Windows is using as your default mail program.

In Opera, you could go to Settings and disable protocol handlers to prevent Opera from asking you to make Gmail your default mail handler. Though I'm not on my desktop right now and can't look up where exactly - just type "protocol" into the search box to find it.

Why are you?

You can turn off notifications in Settings.

What have you tried? Deleting the profile, making sure your video drivers are up to date, etc? Also, what version of Windows, what version of Opera, etc.

Opera for Android does not support extensions.

Actually, you can copy them from "Other speed dials" but you can't sync them directly. Many people have Opera on several machines (say, home and work) and want different speed dials on different machines. There is a feature request for a way to actually sync them; add your support to that request.

Talking about news on the home page or on the news page?

Why the portable version?

The standard "All users" install will have the user's profile under AppData\Roaming and the cache under AppData\Local. If you can arrange to have the latter on the local machine and Roaming on the network it should work.