I'm not sure if this is the reason for your problem, but it may be. The forum posting in question is in a Members Only section of the website. If you are not a registered voting member of ArkGeo, you can't see this forum section and you don't have access to it in any way. I suspect that while you (Gingerose) are a registered voting member, 00shark may not be. So, when you log in under her website user account, you cannot see the Members Only features.
Just my guess as to what's going on, because I just clicked on the link posted above and it worked fine.