I see what you're saying - and i found the conversation you had with chuck of photopost on their site. It looks to me like the same code/block as they're using on :
http://www.photopost.com/forum/
I don't have photopost so can't be much help, but I would reply and ask what code they're using on their 3.8 forum for their featured block that randomizes the images.
Looks to me like maybe they don't want to support vb4?
Email me if I can help more.. maybe look at the code in the block they gave you, etc..
rob@kennedyprojects.com
Rob