When you put a D3D override dll from a mod/hack in a game folder it almost certainly hooks into the same D3D functions as vorpX does. Sometimes that works without issues, but in other cases it may also cause havoc and break everything. Hence the warning message.
You can try the alternative hooking method in case of a such a conflict (config app > general page). No guarantee that improves anything, but with some luck it may. So it’s at least worth a shot.