Ah...ok.  Thanks for the reply Tim!

I know that in PlanG we can add a/c perf data into the Aircraft window. 

Rather than scouring the web and inputting in "real world" data, it seems that "FSX" data is more appropriate.

I'm assuming that FSX knows the performance data, otherwise the a/c wouldn't fly appropriately.

So where do *we* find the "FSX" performance data?  Is there someplace, maybe in the "..\simobjects\aircraft\aircraft name" folder (or some other folder) that I can look to find the data that I need?

Thanks Tim; I'm looking forward to the fix and to spending some more time getting to know PlanG.

BTW, I installed the latest ver of PlanG over the top of previous v3, and installed the latest ver of .net framework at the same time; looks like 4.5.51209.  Haven't tried to uninstall / re-install PlanG yet.

Been trying out v3 and liking it a lot; one problem I'm running into is when I do something that open's a seprate dialog (build the scenery database, add an aircraft profile, anything like that), the dialog doesn't all fit in the box. Since the box can't expand, I lose some lines at the bottom of the box.

I'm running dual monitors at native resolution (1920x1080) on Win8.