To fix graphic glitches:

1.	Control click on the Command and Conquer 3 app and  click 'Show Package Contents'
2.	Navigate to Contents -> Resources
3.	Again, control click on the Command and Conquer 3 app and click 'Show Package Contents'
4.	Navigate to Contents -> Resources -> Preferences
5.	Control click on the file named 'config' and open it with TextEdit
6.	Find the line "fbobackbuffer" = "Y" and change the "Y" to a "N"
7.	Save the file.
8.	I also did the same to the 'config' file in ~/Library/Preferences/Command and Conquer 3 Preferences