Debug Assertion (sometimes)

I have created a little utility dialog I've used in a couple of programs.  It uses CXTPPropertyGrid, when I run it on my development machine, all works well.  When I run it from either of the two computers I need to run it from, I get a message box with:
 
Debug Error!
Program: (my program name)
File: i386\chkesp.c
Line 42

The value of ESP was not properly saved across a function call.  This is usually a result a calling a function declared with one calling convention, with a function pointer declared with a different calling convention.

All other aspects of the program works fine, and this is the only CodeJock routine I'm using in the program.

I've identified it as being when I call m_wndPropertyGrid.Create().  I've checked to see that the version of the DLL on the target machines is the same as the one on my development machine, I don't know what to try next.

Any help would be appreciated!
    C.
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I copied it anyway, it was the first thing I tried.