When I press alt+enter in the address field, the expected result would be that opera opens the entered address in a new tab, but that doesn't happen (for me), is there any way to restore this functionality, I know it worked before (some versions ago...)

The latest opera dev releases won't work for me, I downloaded the offline installer, and that won't even install!

No, this update was bad, as it broke my LastPass extension (among others...), but the LastPas extension can't even be installed now!