Disabled systems stay that way, even after enabling them

I see this again and again-systems that I "disable" because I am working on them "stay" in a disabled (blue) state, even after I enable them.

Any ideas..? Is there a way to 'clear' the disabled (blue) state?

Kent C. Brodie - brodie at phys.mcw.edu

Department of Physiology

Medical College of Wisconsin

(414) 456-8590