What Am I Missing

In the application bar towards the right side, you are able to change sizing w x h. If you check it one way if you change the width or height, the constraints remain correct is: change the height of a circle, it changes the width as well. Or you can turn that off and only what you choose changes.  

Well mine is not working. If have it set to mainstain the contraint, and I click on Height or Width, it does not stay. is: I have a circle that is 2.456" in dia., I have always been able to change that circle size and it stays round, not anymore, I could change it say 2" and it set to maintain...but it might come out as height or width 1.78" Now the kicker, if I change the setting so I am only changing height or width, and I change one or the other, the other will change as well. As far as I know I have not changed any of my prefernces, 

HELP, What am I missing..

Thanks in advance, 

Gary