After sending my 500 and 530 DG supers (With SD15) in to get firmware update then getting them back and they still didn't work I switched to full manual flash control.... and have never been happier. The camera has to meter properly to TTL flash properly. Once you learn the joy of manual flash there really is no better way. Never had to much luck with TTL flash, and i've owned Nikon, Canon and Sony... Nikon was the best though. After I mastered the manual flash setting I feel like a better photographer.