Definitely asking on the authors original thread is the best way to get support. You may also have been impacted by a recent change that ST made to its platform which caused issues with lock device handlers (stock and custom) and correspondingly the SmartApps also.
If you’re interested you should also check out this lock user code management app (it runs fine with the stock device handler). You will need to get access to the RBoy Apps server to download this and all the other apps. We have a promo running on Facebook for a short while if you’re interested.