Update on the viewer for GPU clients

We've been looking into the issues some people have been finding with the viewer.  On the ATI/AMD side, the catalyst 8.9 drivers seem to have resolved a number of issues with the viewer.  

On the NVIDIA side, we have also now released on our download page a special version of the viewer designed for NVIDIA GPU's; this viewer has modifications that makes the viewer run much more smoothly and in general and behave better on a broader range of NVIDIA GPU's.  If you're curious to run the viewer, please check it out (on our high performance client download page).