Review on Yongnuo YN-560IV: Upgraded 560III with YN-560-TX - 2.4G Wireless Flash Speedlite Trigger Controller for Canon Nikon Olympus Pentax by Robert Weeks

Got it and the top moves rather than being a solid piece. So when you try to put it on your shoes it moves back and forth which can't be true. I have a Yongnuo III and it doesn't move at all. I rarely use Flash, so I didn't realize there was a problem until 30 days later. So my guess is that the top is loose. There is something that is causing it not to connect to the camera so it doesn't work. Don't hesitate for a wedding! After I got home it worked. Then again, next time not. I'd love to try swapping it out, but I doubt I'll get much feedback. I'll try today, first of all it's not my fault.