Mirror Displays not working

After recently purchasing a new LCD television, I noticed the composite video out from my MacBook was not ideal - there were two sets of wavy horizontal lines.
I then bought a mini DVI to VGA adapter to use with the television's VGA input, which produced a much higher quality output, free of the horizontal lines.
The problem I have encountered is that I can only mirror the displays, not use different resolutions as I could with video out. I noticed some strange irregularities when changing resolutions. When attempting to uncheck "Mirror Displays" and perform some other tasks in the "LCDTV" window, there is a beep and then nothing happens. The "Mirror Displays" checkbox remains unchecked but no action is taken.
I am using Leopard, version 10.5.1. Is it possible that the problem is attributed to the LCD television? Is there any way to diagnose what the problem is?
Thanks.

I assume you specified the screen in vlc's video preferences and that screen is enabled when you play the video.  I'm guessing it's probably a bug (yet another bug) in vlc 2.x which I also assume you are using.  I long since gave up on vlc 2.x and stuck with vlc 1.1.12 which never has problems selecting my desired screen for full screen display (my TV).
I suggest you look at and possibly post this problem to the vlc mac forum.

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