were these ati graphics or NVIDIA,,,,,,,there have been significant problems with nvidia freezing( Obviouslyyou disabled open GL) Firestorm Has advises Viewer 2 and firestorm Users to wait,until this is fixed.....you frame rate is severely compromised
Firestorm support reply
To be honest, If you intent to use any V2 based viewer full time on SL, I would hold off on the Lion update until this is fixed.
Please see FIRE-2297 for all the details on this issue.
It appears to simply depend on what graphics card you you have You can MAKE it work sure
but frame rate is affected
Thanks KAwyn Galaxy