Cannot save changes to a page

I maintain a WordPress site https://035832e.netsolhost.com/wordpress/ ,
on Go-daddy, with Twenty Ten theme. I have a page “Member List” which has a table with 2 columns and about 155 rows. I am frequently making additions and changes. A couple of days ago, I made changes to a couple of rows and the “Update” button stayed grayed out and I could not save the changes.
Any thoughts?