I used the 1.00B port in an SD450 (I received as a hand-me-down) that reported firmware 1.00A. Most things seem to be working fine. Still testing everything.
I had the same problem with the shoot commands in scripts. I edited the Ultra Intervalometer script by replacing the --shoot-- commands with --click "shoot_full"-- (Ignore the "--", just there to separate off the commands) and it's working.
I am having trouble with the bracketing, however. With Ev bracketing, the first shot is fine, subsequent shots are way overexposed. This is true for all bracketing types. There is some change in exposure, but they're all overexposed. ISO bracketing just hangs the camera. Still playing with this in an attempt to get it working. Looking to do some HDR experiments.
Could be mismatched firmware, of course, but I'm pretty happy with the stuff that is working.