[Plugin: All In One Seo] unable to update keywords

I have installed the latest All In One SEO. I went to add keywords and description for each page. Then when I tried to change the keywords no change is being accepted and no error is being shown. Deleting/ Updating has no effect..

I can change the main setup under settings but not on per=page basis. Hiting update or delete for keywords/description (AllInOneSEo section) on per page basis does not do anything. Old content is still in place..

can anyone help?