24" Imac only showing 2 display resolution options

Within the past week something changed after running a Mac software update that resulted in only having 2 display resolution options. The display choices now are limited to 1900 X 1200 and 960 X 600. I think this happened after having a Mac software update. I don't know what the updates were other then they were suggested as part of the automatic software updates check.
Running OS X Lion version 10.7.4.
Graphics = NVIDIA GeForce 7300 GT 128 MB.
I have rebooted and checked for additional updates put still only seeing 2 choices.
Is anyone else having this problem or ideas why all the other resolution options disappeared?
Thanks

Thanks for quick response. I looked as suggested but those listed are older issues and not recent new events. I guess I will sit back and see if there is a new update coming that fixes issue. Really madding not being able to re-set resolution to one that I have been using for years.
If anyone else knows background/input on why resolution options would go from at least if not more then 10 to now only having 2 would be great.
Thanks again.

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