@eisenheim forgot to mention that you should also have enabled setting 'automatically send crash reports to Opera' in opera:settings. In either case could you check if you got any .dmp files inside any subfolder in <profile>/Crash Reports directory?
@thunderclutch I believe this is related to allowing Opera to handle mailto: links on for example gmail. i think there's something wrong here but I'm not yet sure what exactly 🙂
But just for clarity for others passing by: you do not need an extension to share links via mail in Opera on Mac, you can use the Share menu for this which is a system facility.