Fsbuild-2 Flight Planner

I've recently purchased the ISG gauges, and I have had them retrofitted to the 747-400 (default FS9 panel, Posky model and iFly v2 FDE and sounds), the TDS 727 (with HJG panel, sound and FDE) and the SkySpirit 767 (with Lonny Payne's panel), all adapted to widescreen. Particularly, the 767 works beautifully.

I understand that ISG's VNAV function just keeps a constant FPA climb and descent. While this is realistic for descent, it isn't for climb. Because of this, I installed this Lua plugin into FSUIPC:

http://forum.simflight.com/topic/77792- ... ua-script/

With that, and the IAS speed set by the FMS, I get the best of both worlds. However, when I press "End Flight" before exiting FS9 (as recommended here at ), I'm getting a black screen, and FS9 does not respond. If I don't use this Lua plugin, I can end the flight with no problem. How can I exit then, without having to kill FS9 via Task Manager?