I have the bug which makes characters "invisible" unless I have Environment Mapping on Characters set off in Options. I fooled around with older ATI drivers to get rid of that workaround, and finally found working ones (these are 8.723.2.0) - then I quit NWN, tested Fallout New Vegas to see if newer games had any problems, and it was fine. But when I went back to NWN, the bug was back. How can this be?

This is an Acer 7551g laptop with ATI Mobility Radeon HD 5650.