Yes, I can relate to that. Contacts with DXO regarding the NIK collection were less from satisfactory so far. The issue described in this thread is one thing, another is a bug they introduced in Silver Efex and other NIK tools, which makes the curves tool quite hard to use. They promised to fix it, released a new version but still no fix.
In any case, with that experience I am not inclined to try any of their other stuff, but I am hooked in Silver Efex Pro, so I'll stick with them for that.