Ok, I did some digging and there seems to be a solution here:



http://answers.ea.com/t5/Miscellaneous-Issues/Mac-Edition-Max-Resolution-available-limited-to-1920-x...





For me, I right clicked Simcity in the 'my games' section of Origin, then clicked 'game properties' and added the line -r:2650x1440 and clicked apply.

When I loaded the game first time after this it defaulted back to 1600x900.

I then set the resolution back to 2560x1440 in game which resulted in the black bars. However when I restarted the gem this time the resolution was at 2560x1440 and working fine! No black bars. Works in game too, not jus tthe menu. Seems like this is a fix.

Hope this helps anyone else with this issue.

Thanks to eadennis and eanils for the original links.

No thanks to goraththeelder.

