I recently got a really good deal on a used FL-50 (non-R version) and demoted my Zeikos flash to the macro rig. The FL-50 is clearly sturdier and works great. However, lately I've noticed that (unlike using the built-in flash or the Zeikos) my G5s will almost never force the shutter speed down to 1/160 when I turn the FL-50 on. Typical situation: I'm photographing wildlife with the G5 and 100-300, at shutter speeds as high as I can get them; say the camera's in S mode at 1/500. The light changes, and I decide to use the FL-50 and Better Beamer. I switch the flash on, and the shutter speeds stays at 1/500, rather than defaulting down to 1/160 as it has with every other flash I've used. Am I doing something wrong? Is my FL-50 messed up? Any suggestions would be appreciated.