The login issue is from your internet settings. You need to enable 'cookies' in your browser. Once you do that, the forum puts a 'cookie' on your machine that tells the forum that you are logged into the forum. When you click 'log out' the cookie is cleared from your browser's cache and you will have to login again to access the forum.
The other issue may be a java-script issue or it could be an internet provider issue. There is not a function that blocks images. Even guest can see images when they visit the site. Some of the functions require Java-script to be enabled. These are mostly functions and links throughout the site. Try turning these settings on and see if that helps.
What browser are you using? OrchidTalk is designed to be used by FIREFOX, but Internet Explorer, Opera, and Safari browsers are all compatible.
Cheers,
BD