It’s a bug in the way Tinderbox 8 interacts with scripts. Scripting was added to Tinderbox about a week before v8 was released, and is not fully fleshed out. I suggest you skip the forums and write Mark Bernstein (bernstein at Eastgate dot com) directly with your questions and suggestions – he is open for exposing more commands in the Tinderbox dictionary for people who want to script.