The HST3D GUI FAQ
Do not manually delete or rename locked layers or parameters. They are locked for a reason. You are sure to run into trouble if you mess with them. You will need to manually recreate the layers or parameters you destroyed with exactly the same names as before to correct this problem.
No. Although Ken Kipp was very helpful in answering questions about HST3D during the development of the HST3D GUI, he has never endorsed the HST3D GUI. In fact, as a USGS employee, he is prohibited from endorsing it.
by Richard B. Winston