Correct initial visibility of layer waypoints.
Correct duplicate layer waypoint loading to RouteManagerDialog list.
Correct potential pan key runaway on long SENC creation.
Improve quilt logic regarding ENC cell inclusion criteria (FS#???)
Correct Mac Toolbar visibility on Docking (FS#976)
Correct dialog return logic.
Improve ENC error checking in non-GL mode.
Convert SingleInstance Checker to Windows only.
Avoid crash on MAC if shutdown with RMD open.
Improve serial port write logic for better thread safety.
3.3.420
Correct Windows compile warning.