RV Embeded PDF – Permission issue with goole

I am suddenly getting a message that my ‘content cannot be displayed in a frame’ when i go to the page with my embedded pdf.

It was workng fine before (well on most browsers but not all)

It says the publisher does not allow the content to be displayed in a frame……… can someone help? why has this happened all of a sudden? I didn’t change anything.

http://wordpress.org/extend/plugins/rv-embed-pdf/