No sweat Burr - if you run into it again where it doesn't seem to be working let me know if there was some particular operation that you were using.

One other note - if you exit the Image command and then go back into it you won't have any undos in that case, the image undo history is erased when you exit from the Image command, it's meant to just enable undoing tweaks that you just performed in that same command run.

- Michael