The same version was crashing on launch on my Mac Pro have updated to 44.0.2510.1159 and it is working fine.

Opera is using a port not assigned as a standard web browsing port to check for updates, and your firewall probably blocks it. Check the blog or here in the forums - or subscribe to the blog's newsfeed - to see when a new version comes out and download it manually. (You can even install the new version while Opera is running, but you'll have to restart Opera once the installer finishes.)
I have seen that message once or twice when there were network issues between here and Norway, but never for very long.

Thank you sgunhouse

I just updated to 44.0.2510.1159 and the issue is fixed on my Mac.

I've seen that message in Opera PortableApps version.

Did you updated Opera manually in those cases after seen the problem? Or you are in a "very" old version waiting to selfupdate?
You may have to download the installer and make a manual update / installation, maybe this fix the problem for future uptdates.

I have to manually check and download updates when they are available. I have a feeling these issues maybe caused by the network setup adopted by our IT department.

The rest of the system works fine. Unfortunately I cannot upgrade the OS any further due to the age of the Mac so I will stick with the version of Opera I am using.

I created another user account on the mac, logged into the account, installed 44.0.2510.857 in that account and Opera still crashes on startup.

Hi avi Opera 44.0.2510.857 crashes just after I start the application.

I just installed Opera_44.0.2510.857 on OSX 10.11.6 and it crashes. I have gone back to 43.0.2442.1165 and it is fine.

Opera 43.0.2442.1165 on OSX 10.11.6 in a corporate environment.

When I check for Opera updates I get the message "An error occurred while checking for updates".

I also keep getting pop ups on the screen advising the version is available to download even though it is already installed.

The two issues have been on going over several versions of Opera and I was hoping someone knows of a fix please?