Brilliant thanks Clark ... I had assumed there was some sort of problem

So I lost my argument with the Sketchup Robots, and had to make some updates to my code. But a new version compatible with SU17 is now available from the usual location:

http://extensions.sketchup.com/en/content/timber-framing-extensions

Thanks for your patience, and sorry for the hiccup.

Thanks Clark, for staying on it!