The tabs that used to be at the very top of my screen have suddenly all dropped down a line - leaving an empty grey bar above them (apart from the Opera menu button which is still on the top row). I have no idea how to get it back to normal.
Can anyone help?

I'm having the same problem. It's been working fine for a long time (at least a year or two) and has suddenly stopped working. What do you mean by a standalone installation?

I also have this problem: can anyone help?

Can you tell me where I can find the new help? All the links I can find relate to defunct versions and have no version to the version I have (27). I want to find the history settings but I have no idea where they are.