I think a few people have had issues with this, but I can't find a solution anywhere. I am getting pages truncated when I try to screengrab them. See these examples:
http://willj.net/willj.net.png is the grab of http://willj.net/blog/
http://willj.net/finder.overcycle.com.png is the grab of http://finder.overcycle.com/location/USA (Warning, second URL is a large file with heavy JS)
I would use --auto <id> except I will not know in advance which pages I will need to be grabbing so cannot examine the source in advance.
Any ideas on this? I am using the latest version of khtml2png2 on Debian.
What command line did you use? I may be a bit late to answer, but I can't reproduce the problem.