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Are you sure that's right. I have the 550d and the canon 430ex, and have after reading this had a little experiment. I could use live view with the flash attached in all modes. It appeared at first to work in 'portrait' mode and not in the other creative modes. But what I realised was, that portrait uses a low f no. and so more light came through. So detail could be seen on the screen. When I moved to a brighter area and clicked through the modes then live view appeared to work normally. I then tried it in the semi auto modes and they too were fine. I would imagine that when using live view and flash, then you are probably intending to use the flash as a complimentary light source, in which case the live view screen will be black due to the lack of ambient light, rather than not working. Have a trial in a brighter area where you have good backlight and would use the flash as fill-in. Hopefully you should see it working just fine.
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