How to clean old Active Sync Server Setting

Hi,
I setup gmail as my active synce server and it was working file for me.
Now I have need to change it to some other emailprofile, so I tried of changing the server settings and save them.
But I am facing wiered problem like it is still showing old settings and does not save new settings and it does not show any message also while I press save and come out.

Did anyone face this issue or hase any idea how to fix this one.
Thanks in advance
Manjul