I am guessing that because PowerBuilder is 32-Bit, I should be using DWord and not QWord.
Anyway, after lots of experimenting, it doesn't seem to matter which settings I used in the registry for Dword and the name of my application (which is a Winform App).
The only thing that is consistent is that I can use my dropdown list to recenter the map until the cows come home. It's the click, double click and drag events that cause the problem with the map.
The problem is that I have no idea how of if that is managed in the application. Seems like not.
Still, if take the generated defaultmap.htm and open it in any browser, there is no problem at all. I can click, double click and drag and never a problem.