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Les - what settings? AI servo? High speed shooting? etc. I have not had any issues with mine, except I went to shoot a hawk this morning and my camera would not respond. Helps to insert a CF card before the outing.
When I got to the shooting location, I turned the camera on, and all I did was set the ISO at 400, set the shutter speed at 1/1600, and set the aperture at f4.5, which were the manual exposure settings I wanted to use. I have the camera set to go to sleep after 1 minute of non-use. So, a few minutes later when I was ready to shoot, I half pressed the shutter button to try to wake the camera up, and the only response I got from the camera was "ERR" in the top LCD. It cleared after I pulled both batteries and reinserted them. I only took a few dozen shots today, and had no issues after the initial error. Again, perhaps it was just coincidence, but, considering that I've never had an error, lock up, etc. in 35 months of using the camera, I had to immediately think of a possible connection between the error and the fact that I just installed the new firmware.