Why lost my System Preference Display?

After installing Lepord 10.7.4 I have lost the Display resolution except for 1920 x 1200 and 960 x 600.  Neither of these is acceptable for my iMac.  Before downloading 10.7.4 I had all kinds of resolutions shown in System Preference Display.  How can I can I get back to them?

A reported fix:
https://discussions.apple.com/message/18572141#18572141

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