"Driven" box being unchecked from drawing?

I was wondering if anyone else had seen this occur....

I will create a part drawing, import model dimensions and begin to move into place, add tolerances, extra notes to the dimensions, etc., nothing exciting here and then the following happens...

Every once in a while after editing one of the dimensions properties (not changing the numeric value) it will cause the view to be rebuilt (hatched patttern).  After rebuilding the drawing I notice a yellow triangle error in my feature tree.  Upon further investigation the sketch in the part shows the error and sure enough the dimension I had previously added as a reference (driven) in the sketch has mysteriously changed to a "driving" dimension (box is unchecked).

Its not a show stopper but it sure can be a pain in the neck at times.

I am running SW 2009 sp5.1 on XP 64bit but have seen this occur on a 32bit install as welll.

Happy Memorial Day!

Regards,

David O.

SolidworksDrawings And Detailing