Hey @avi guess what? Today I upgraded OSX to version 10.12.4 and both versions of Opera (stable and developer) started to work again.

Thank you very much for your help

Sorry for the delay, I tried to shut down the computer, unplug the UX1 and turned on the computer but nothing changed, always the crash page

as I thought nothing changed...

iMac (Retina 5k, 27-inch, Mid 2015)

Since you say that it's an audio initialize problem I've got to tell you that I have a Line6 UX1 external input-output audio unit plugged in that I use on daily basis to listen from headphones and record my guitar.

Now, just for fun, I try to switch to normal Mac audio output and see if Opera is more happy about it. (but since the input will be still through the UX1 I think it will fail...)

And here we are. Email activated, opened Opera Developer (crash page), clicked on bookmarks icon (crash page), opened opera.com (crash page), opened google.com (crash page).

Don't know if it can help but I noticed that every times it make a little loading but nothing happens.

Your turn now

All right, installed the developer version (very nice ui indeed) and got the crash page no matter what I try just as the stable version. I suppose that the developer version send all the reports so should I activate the email for this version also or does it take it from the stable? And if I have to activate it can you tell me the string to type?

Speaking about the preferences I used an application called AppCleaner and deleted everything that was Opera related so I think I deleted everything and not the preferences only.

And... done, inserted the email and "opened" a couple of pages, even if I may have disabled the option to send reports to Opera, back in the days, if that is and existing option in the preferences. Maybe there's another terminal-string to activate it if that is the case?

And the magic email address is...: luzzuc@helpme.pls

And thanks to you @avi for trying to help me

Hi @avi sadly Preferences and opera://flags they both show the crash page

Hi guys, suddenly Opera show me the crash page, that and only that page no matter what I try to do.
I tried to delete the preferences il Library -> Application Support but nothing changed, then I uninstalled Opera and deleted the preferences and do a fresh new installation and nothing changed...

anyone knows what's happening, it was working well till yesterday...

OSX 10.12.3 Sierra
Opera 44.0