Tried the workaround, didn't do anything, sadly. Those popups are still here. Restarted Opera, even restarted my Mac.

I use my OS X in german, maybe it's also a language issue?

This problem is still unsolved!

It is extremly annoying, I already considered changing my default browser to Chrome because of that bug.
I already uninstalled all my extensions and addons to have a clear Opera. Even tried deleting all settings and starting vom scratch but still it didn't work.

Version: 20.0.1387.91
Update-Stream: Stable
Betriebssystem: Mac OS X 10.9.2 64-bit

I have the same problem. Since Opera 17, the blank popup reappears on every page and is super-annoying.

First I thought it may be a plug-in, or an extension. I disabled all plug-ins, uninstalled all extensions, but it's still there.

Please help! I don't want to change my browser (using Opera since Version 3...) just because of such a glitch.

PS: OS X 10.9.1, Opera 19.0.1326.59