Driven Dimension Setting Won't Stick

I'm still on SWx2008 SP5. I have a sketch containing a dimension that refuses to do anything but be set to "Driven". There are a number of configurations, some derived. I uncheck driven from within the sketch and it stays that way until I change configurations, then it goes back to "Driven".

Short of deleting the dimension and recreating it in all its variations I'm at a loss as to what to do. Is there any way to uncheck "Driven" and make it stick? Or maybe I should ask what could be causing it to return to "Driven" after I uncheck it?

Thanks for any help................Bill

SolidworksSketching