well I dont see anything wrong then what I have explained here
You had under edit ad types the wanted trade set to yes and under edit categories no categories setup to that type hense the empty second box when you try and select those types.
I merely turned them off and you could be fine
Now I am gonna say this again since it seems every page on your site is broke except the forum
Bass Boat Magazine
Look at your portal your classifieds looks the same you have some code displayed and your page stops so nothing is every loaded so you have an issue you must solve with your
vb.