Corrects a phenomenon that in images captured by continuous shooting, and under certain conditions, barely noticeable traces of the immediately preceding frame may be visible.
Or at least hopefully it will correct the problem. Recently I posted that Canon posted a firmware update for the Digital Rebel XS/1000D to alleviate the "Error 99" problem. I've tried multiple times to fix the problem by installing the prescribed firmware update, and while each time the camera tells me it's worked, I'll push the shutter button and the same error pops up. So firmware updates don't always work for every camera. Hopefully the 7D one will fare better.
Will any of you be downloading the 7D firmware update? If so, please let us know if it worked for you.