Hi Gergerly and James. A little more context on this. I opened this old object, originally created by Matthew Lohden in 2007, because the 3D text was castling shadows on the surfaces and I wanted to add a few lines of code to stop that. Everything was working fine other than that, including the index checking. It’s only after I saved the changes in AC21 that I began getting the error in the 3D window or settings dialog. The script checker returns OK in all scripts.
Thanks for your help.