I have been emailing back and forth with the viewer developer, Siana Gearz, about the 1.5.6 version crashing on me and she has been awesome. She is extremely responsive and I feel very comfortable in using her viewer. Plus a friend of mine's hubby who used to develop viewer code in the past took a look at the build and gives it a thumbs up.
Apparently with her builds after 1.5.5 on systems with a 64bt OS and nvidia 200, 400, and 500 cards are experiencing a lot of crashing. But she has sent a beta to try and I am planning on downloading it tonight. In the meantime I rolled back to 1.5.5 and all is good.
"Old stories are like old friends. You have to visit them from time to time." Bran - A Storm of Swords, pg 315
Visit me at Elle's World http://ellecouerblanc.com/