I have been pulling my hair out trying to sort this out. I had been using DirtySuds - Embed PDF which is now broken with malformed code. I now have tried RV Embed PDF, Google Doc Embedder, Embedly (which is a paid service- what is this doing in the plugin repo?, TGN Embed everything and others.
The page where the pdf should be displayed is now blank using multiple plugins. How do I fix this? Everything was fine until I updated this install of WP but as I hadn't used the plugin on a page in a while, I'm not sure which of the recent updates broke it this functionality.
I tried several templates including 2011. I am at a loss and need help. :)