Okay then possibly you need to turn off or double check some settings that will go away eventually.
This will be in the ubb cp,
Control Panel » Primary Settings
[-] Advanced Options
Disable HTTP Referer Check? -Turn it off-or select it.
That would be a start.

I have no idea of what version you are using since you don't post the url to your forum.

Blue Man Group
There is no such thing as stupid questions. Just stupid answers