I did that an it solved my problem, at last! Why did I missed that in the first place??? It never struck me that it had something to do with the Universal Access Panel but rather maybe with the monitor's prefences.
Great, many thanks !
May I keep your name for future reference?
<Email Edited by Host>
Indeed, sometimes one would expect certain options to be better identify and/or placed in a more recognize area by the users!
What made me suspicious was the fact that if I started a software (FrontRow) and quit it afterwards the settings for my display came back OK automatically. The other hint for me was if I logeed in as new user, the settings where also OK. I wish there would be documentation on the subject? ... I recognize thought where I went wrong was in my interpretation of the appearance on my display: it had to do with the contrast and not with the resolution of the monitor.
So thank's again for the tip and I will gladly follow you in the futur.