I have a Quantary QDC 900WA bounce flash that is designed to work with Nikon's iTTL system. Several times recently on my D50 I have had to cycle the power or completly re-seat the flash on the shoe because I would shoot and the image would be black. Almost as if the flash were firing before the shutter opens. The flash fires everytime but only one out of 5 pictures or so looks right unless I re-seat or cycle power. I put the same flash on the stroboframe and the hot shoe cord connected to my D200 and am having the same problem. The D200 is 2 days old so I think that rules out a camera issue and points more towards the flash. If the flash is in manual mode, it fires fine and I can still hear the flash zooming in sync with the lens. Any thoughts? Time to upgrade to the SB-800?