I flew this weekend and tested flight plan sharing in both directions (Tablet to 740, 740 to Tablet) using Stratux on a Pi3 and the latest Stratux beta release, 0.9b1. Everything worked as advertised.
At home tonight I'm testing my Pi2 Stratux, first with the TP-Link dongle and Stratux v0.8r1 (b2eb382c1a). Plan sharing works as advertised in both directions.
Powered down the Pi, swapped wifi dongles, and test with the EdiMAX: Plan sharing works as advertised in both directions.
Updated the Stratux software to v0.9b1 (89107818b8) via the web interface. Still has the EdiMAX wifi dongle inserted. Flight plans cannot be shared from 740 to Android, nor from Android to 740. Powered down the Stratux, swapped wifi dongles, and tested with the TP-Link. Flight plan sharing works as advertised in both directions.