Random external monitor (HDTV) resolutions

Prior to the 10.5.6 update, I had no problems with connecting (VGA) my MacBook to my 27" HDTV at a resolution of 1366x768. No black bars, no distortion, no problems. To assist in my case, let's just say, I had wallpaper "A" for my MB screen and wallpaper "B" for the HDTV.
But ever since getting the update, I sometimes get another wallpaper background which we can call as "C". Another problem. The resolution changed from 1366v768 to 800x600. I couldn't find my default tv resolution anymore other than 1024x768 and a host of others. The closest one was 1280x768 which would leave black bars on the sides. The display prefs window calls it "Display" instead of the TV name.
However sometimes it works like how it used to and you can tell because:
1. The wallpaper is switched to "B" which was how I had originally set it up.
2. The resolution is 1360x768 and covers the full screen.
3. The display window in Sys Prefs shows it with the TV name instead of a generic "Display" tag.
Anyone out there who can help? Seems like Mac OS X uses some kind of a monitor profile but it's driving me nuts.
Thanks in advance for your comments and suggestions.

Forgot to add this but I also did a PRAM/NVRAM reset holding the CmdOpt+PR. Sound settings defaulted but no change in the TV resolution.
I tried a safemode login but still no luck with the HDTV.

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