It was working fine, until it suddenly stopped firing the flash. It charges, the Test/Charge button lights up (you hear the sound it makes while charging), but the flash doesn't fire; both via the camera when it's in hot-shoe and via the test button on the back of the camera. My flash was well taken care of, it was never dropped, etc., one day recently while taking pictures it literally just stopped firing. There's no excuse for a product failure such as this. And from what I can see, I am not the only Fujifilm customer having problems with Fuji's flashes.