[Dev-C++] False Warning "Source File not Compiled"

[Roger F. <ra...@ha...>]

Aloha from Honollulu,
    I'm using wxDevC++ which has DevC++ 4.9.9.0 and wx-beta 6.4.    I 
use the "Empty wxWidjets Project" that Malcolm Nealon kindly provided 
when I had my first problem.  I've been going through the tutorial 
"Programming with wxWindows" from the wxWidgets Documentation page. 
Things had been going fine and I've been creating new projects for each 
section of the tutorial.

The Problem:
    Sometimes I use the seperate Compile, and Run, buttons in the 
toolbar instead of the green arrow Compile & Run.  This last project I 
used the Compile button, but when I clicked on Run, I got a Warning 
window: "Source file not compiled."  I clicked on the green arrow 
Compile & Run and it compiled (again) and then ran just fine.  I tried 
Rebuild All, then Compile, and then Run, but got the message again: 
"Source file not compiled."  I looked at the Compile Log and that has 
"Compilation successful" at the bottom.
    So does anyone know what's going on?  There are only 2 files in the 
project. a .cpp and a .hpp.  No other files were open in the IDE.  Plus 
things were going fine with at least 5 other projects compiling and 
running prior to this.
Mahalo (Thank You),
Roger Furer