Hi Barry,
I switched to Twenty Fifteen, renamed my plugins-dir and made a new plugins dir where I only had your plugin. Activating becomes a problem when the wizard starts, see my initial comment for the ‘error message’.
After the error message I tried to ‘restart the wizard’ from the setup, but once again the problem as described earlier happened again.
So, the same problems remain even with Twenty Fifteen and all other plugins disabled? Looking forward to your reply!
Groetjes!