I've written up a patch for this, but I'd like to look it over next week before I check it in. The error is not reported the first time because all_good check for data is used to decide whether to start the GUI for to3d. I've written up some changes to let the user know of the various issues that will trigger the GUI or any errors that would normally go to the pop-up errors if not in GUI-mode. Warnings or Error exit messages will be emitted. Thanks for the suggestions.