Yes, it does happen with more than one user. We have tried three different administrator accounts. But I would be willing to give you admin temporarily if you think it will help. This forum won't let me email you, so would you please email me?
I would just like to see the javascript being loaded with the page. You are very close to being able to email me, anyway, but I will send you an email.
As I suspected, the problem is related to javascript. You seem to be missing the javascript files need to have the page working as it should. In this case, the files are inc_code.js and selectbox.js. You need to get them from the Snitz download zip file and upload them to the forum folder.