I'm not entirely sure I had this problem with version 7.
Right now I'm using the latest update of 8.
On -most- computers grabsprite works like it should, but on my new netbook vs. old it exports emptiness.
I found a work around using CREATESCREEN and SAVEBMP, works about the same as GRABSPRITE except it works for the Netbook that was having the problem.
Thought I'd bring this up if anyone else has experienced something similar.
oh noes! Please post a report of the OpenGL viewer:
http://www.realtech-vr.com/glview/ (http://www.realtech-vr.com/glview/)