If you say that the resolution setting is not showing, do you mean that there is no dropbox to select a resolution, or that the dropbox is empty?
In any case, can you try the following: in the NVidia Control Panel or the ATI Control Panel you are able to choose a refresh rate next to your resolution, check to what that is set. Try to play with that value, choose a resolution for example that has a 60Hz or 75Hz refresh rate.
Report in this thread what resolution and refresh rate you have set - whether it worked or not. If we can reproduce this problem by tomorrow, we can have a fix the same day.
Thank you,
Alex
