So I used it on camera last night with no problems but I went to use it today and it's not firing while on camera. It fires if I hit the test button. It fires if I put it on remote and use the on camera flash as the master and it fires if I use the SU-800 as the master. But it doesn't fire if it's on camera as master or regular. Any thoughts? EDIT: I should add that if I put my SB-600s on the camera they work fine.