Unstable Monitor Size

Hi, All!
I have monitor LCD 17" Prestigio, Suse 10.1 and integrated video (Intel 
855g).
I set up monitor resolution in 1024х768.
Also I set up monitor size vert&horiz refresh rate by myself from Monitor 
Manual.
Here is my problem.
Sometimes (I can't set up algoritm) after gdm (gnome) starts monitor size 
stretch in horizontal direction.
After restarting monitor size sets up correctly (but not always).
Such problem I have only with this monitor.
What can you tell me about this?

Alex,

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