Interesting:

+++ EFASS CHANGELOG +++

1.0.1034.8252
+ Fixed Web Search for Origin/Destination Charts
+ Server Performance updates
+ Preparations for new Upper Wind Integration

Had problems downloading the update, evetually succeeded.

Hmmm... I had all but given up on EFASS due to its apparent abandonware status. If they fix the crashes and modify it so it uses the semi-circular rules when calculating cruise FL I may take another look, otherwise I'll stick with the excellent SimBrief (planning) + NOAA plugin (weather).