Quote Originally Posted by Speed
Off the top of my head, I'd say you're not using the correct flash sync speed.

Most manual camera's have one speed at which the shutter and the flash will sync up. Look for a mark (probably an X) on the shutter speed dial. That is your flash sync speed. If you don't see a mark, try using 1/60 second, as that is the normal flash sync speed for most camera's.

Hope this cures your problem.
Thanks! I will have to try that out!