Various UI controls do not load their backgrounds/images properly when starting the game in Fullscreen mode, regardless of resolution/retina settings. The main menu and options settings seem to be most affected, in the game most appear just fine (except the 'NEW' badge on items).
The workaround is starting the game in Windowed mode instead, which does not cause this issue. Interestingly enough, the game can be switched to Fullscreen mode after launching and the issue does not occur. However, this requires toggling back and forth each time the game is launched to avoid this problem.
Conversely, if the game is started in Fullscreen mode and switched to Windowed mode, the issue persists until the game is restarted in Windowed mode.
Steps you took for Issue to occur
Start the game with the default settings in Fullscreen mode.
Where does the bug occur ?
Immediately on game launch, I can see the issue in the game menu/options screen (see screenshot for comparison).
No mods or non-Maxis content.
Expansion Packs/Game Packs/Stuff Packs
All expansion packs, game packs, and stuff packs currently available.
I have not noticed this occurring previously on OS X 10.11 (Yosemite). It has been several months since I have played, now using the OS X 10.11 (El Capitan) release candidate build.
OS X 10.11 (El Capitan) (Release Candidate 15A282a).