Jim,
VFP doesn't use an intelligent MAKE utility to determine if a file should be recompiled when an include file has changed. Much simpler that Roi's suggestion just COMPILE TheForm after you change the .h file.
>My problem is that I make a change in the Images2Web.H file and run the form again (in development) and the changes made in the H file don’t take effect. Is there something obvious that I am doing wrong?