Originally posted by Royce Howland On the topic of the firmware update, with firmware 1.1 my 645Z does seem more stable. I think another bug I knew about is gone, knock on wood -- the issue with the camera locking up after an AEB sequence with 2-second self timer also in use has not repeated since I did the update. But it was an intermittent problem so it's hard to say yet whether it's really fixed or not.
Okay, the above bug is not fixed by firmware version 1.1. Several times over the past week while doing some fall shooting with 5-shot AEB and the 2-second timer drive mode, the camera locked up at the end of the sequence and was unresponsive to any controls except the power switch. In each case, the 5th exposure was erroneously the same shutter speed as the 4th exposure, i.e. the 5th file was not correct. As before, turning the camera off & back on cleared the problem and shooting continued... usually without repeating the lockup or incorrect 5th exposure if I simply immediately re-shot the exact same AEB sequence with no settings changed.
I observed a new issue that seems unrelated -- twice while in Live View, the camera locked up so hard that even turning off the power switch would not clear the problem. With the power switch turned off & the top LCD blank, the Live View display actually stayed live and showed an image. Only popping out the battery was able to clear the problem. I never saw this behavior on firmware 1.0.
Another issue I saw is that during 5-shot AEB sequences, sometimes the shutter speed doesn't get updated on the top LCD display. The same shutter speed will be shown for a couple of successive frames, even though the actual recorded files are at the proper shutter speeds called for by the AEB settings. This is a cosmetic issue, fortunately, not affecting camera operation or recorded files.
So some stability improvements are still needed after firmware 1.1...