Can no longer get native resolution on monitor

For the better part of a year I had two twin Viewsonic monitors set at 1440x900 with my Mac Pro (late 2011) Radeon 5770. One plugged right into the DVI, then another with an Apple Mini-DP to VGA adapter. Everything was fine, and I'm not sure what changed, but now, suddenly, I cannot find the correct resolution in Displays, and it is simply displayed as "VGA Display" and the display is blurry. I have reset the PRAM, reset the settings on the monitor, repaired disk permissions, thrown away some system prefs files I found via Google, and plugged cables in every possible combination (as I have a myriad of such cables), I even have a secondary Mini-Displayport to VGA adapter. All signs point to software. I have the latest update of Mac OS X Lion.  I have even tried SwitchResX to no avail, but to be honest, I didn't spend the hours of time it would take to study monitor technology, refresh rates, hsync, vsync, etc etc...
Can anyone help with a suggestion, I'm going bannanas over here... I have Applecare but I'm sure they'll just tell me fresh to reinstall Mac OS X. (Hrmm sounds like Windows.. Oh yeah, that reminds me... in Bootcamp the monitors work fine.)

it is simply displayed as "VGA Display"
That is how your Display Identified itself to Mac OS X. If the display only provides that as a name, and does not provide its full capabilities, Mac OS X cannot determine its true capabilities and you get an abbreviated set of resolutions to avoid damaging your display.
As you discovered, you can use a cheater program like SwitchResX.
There is nothing wrong with your Mac. That is the way it was designed.
There is nothing wrong with these Forums, either. They have always been User-to-User forums, and Apple never posts here. If you want Apple to help, you need to take your equipment to an Apple Store (free evaluation) or call AppleCare and pay their charges (which they may waive later for certain problems) if you are out of your free phone support period.

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