Quote Originally Posted by VictorN View Post
"on start" of what?
Is at a WinMain? Or CWinApp::InitInstance? Or your OnInitDialog?
Did you set breakpoints in the beginning of all of these functions? Did you debug?
On start of the application. From the OP: Environment: Windows XP Pro, Visual Studio 2008, MFC, C++

When I looked at the call stack, none of the modules I wrote were listed. I am not sufficiently well versed in MS internals to troubleshoot and interpert their code. (I am not claiming the problem is in their code, but the symptoms originate from within their code.) Note again, I made a change, solicted the error, reversed the change, eliminated the error. That's a a pretty good basis for concluding that my change was not well advised.
Maybe as I get better at this I will be more able to investigate this type of problem. In the mean time, I have code to write and test.