I followed Bhopalmp's directions and found that somehow the Visualization of Diagnosis-colors radio button had been unchecked.I checked it off and it worked like a charm. Haven't had to try ferdo's suggestion but I may find it useful in the future (hopefully not).
Thanks again guys
Best...
I am just learning Catia and do not have access at home to online help with my company laptop. Why do parts I constrain no longer turn green? I have opened parts I know to be good and looked at their sketches and the same holds true for them. All lines remain white. Help!