Michel,

>From what was told to me, it seems that the problem is from my code as no other WWC users have it. But, then, there is always a first one. In the meantime, I am still trying to find it.

One thing to check is that your project settings for the EXE are set to Single-Use instancing on the Project Info / Servers tab. You probably have it correct, because you'd likely be seeing many other strange happenings, but let's eliminate that from the list of possibilities by checking it.