Off screen doesn't work well with double-buffered graphics configuration on most
graphics cards. We may need to find a way to disallow such request and inform
See also :
1) Issue 190 to track - modify all of our off-screen example programs to request
a single-buffered graphics configuration.
2) Issue 189 to track - look into providing a better error message if a Pbuffer
can't be created from a given double-buffered graphics config.
3) Issue 100 : Offscreen Capture crash JVM