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Using flash is supposed to be the non tricky business. I can only see two other explanations:

1. The flash is not strong enough, decrease distance or open up the aparture to test.

2. If you are not softening the flash enough you will get small parts that gets overexposed and when the camera measures the ligth it will compensate for this. Then the rest of the image will be underexposed compared to those highlights.

I?m using E-TTL all the time and do not experience those problems.

/Krister