When I use the bookmarklet button to test bookmarking . Only some URLs might able to display the post page.For other URLs it is just showing an error:
404. The requested page was not found.
I have deactivated all the plugins .But problem not solved .I have changed the theme though .
Do any body have Idea on solving this problem?
I am not sure how to solve the problem .I copied the screen shots of error here .

wweb.in/wp-admin/press-this.phppage from the pop-up) Does it make a difference whether you selected some text before you clicked the button or not? – Jan Fabry Oct 1 '10 at 7:48