User can't select category

First of all, this is an aside to the owners of this forum. It is very frustrating that when i first try to post to the forum i have to login and yet there is no login button on the forum page so i have to go to the members area and login and then come back to the forum.

Ok, on to the problem. I have setup 5 or 6 listings packages and i’m pretty sure they are setup correctly but users are not able to select any category on my website when they go to place a new listing – mustangtraderonline.com. Try it on the free listing if you’d like. Since they can’t select a category (a red circle with line in it comes up) they can’t submit the listing. The free listing package is setup with NO for multiple categories but the other listings are setup with multiple categories and yet users still can’t select even one category.