I have made a basic VFP 5 COM Server.
Its services are used by a VB 6 front end.

The VB 6 programmer tells me whenever the COM Object is being used by his VB 6
program the MsgBox commands get skipped.

The messages boxes simply do not get displayed.

He has worked around this problem by displaying his own custom made forms rather than using the MsgBox command.

Am I doing something wrong?
Are there compiler settings I am setting incorrectly when I build the .dll file?

My code is a single .prg file containing DEFINE CLASS OLEPUBLIC ... ENDDEFINE along with the properties and methods of the COM object.
This single .prg file is the 'main' file of the project.

TIA