There seems to be a problem between MyphoneExplorer and the latest plugin of Lightening. I get an error message "Loading entries from Thunderbird failed!" By disabling the Lightening plugin I am able to synchronise with Thunderbird. The Lightening plugin was updated today 20 September 2017. There doesn't seem to be any method of alerting the author to the conflict and the MyphoneExplorer log file doesn't appear to give any relevant details, just the error message I quote above.
The MyphoneExplorer plugin is version 2.0.19; the Thunderbird is 38.5.0. version and the MyphoneExplorer version is 1.8.8
Just a heads up really.
Anne