Using same settings as previous version 2.06 no changes, but there was a few additions to some settings that did not exist in previous versions so ill try toying a bit with the settings on them.
Do you have glprogs and assets from SVN?
The VBO beta package has some newer shaders from SVN but Duzenko just did some optimizations that require new glprogs
in the latest build.
Note: I will remark that the ambient light in GLSL does look a little different than the ARB one.
It was decided that the "light originating from the player's eyes" approach to fake reflective lighting
was not the best way to do things so the GLSL ambient has the light coming down from the sky so there is
at least some plausible physical explanation for the directionality (outdoor moonlight).
Note 2: The current SVN doesn't use native gamma control and instead does gamma correction in software
via adjusting the ambient world lighting. If your monitor has any issue with independently adjusting
gamma vs brightness, you may see that the SVN version gives you more control of those attributes independently.