Sorry its been busy here because of CES. Steps below:
1. open terminal.
2. Then type: telnet (ip address of HG)
3. Open App. Try adding the problematic device.
4. Wait until HG finishes add process.
5. Copy all output from terminal into a text file and email me the text file.
Reply To: Can’t manually add insteon devices 2017-12-21T10:03:43+00:00