@daveozric. Ok, I just did a quick test on Chrome and IE 9. It showed on Chrome 16.0.912.77 just like it did on Safari.
On IE9, I did notice that it started to load and then went blank. Then after I click on the “Open in a New Window” icon in the top right hand corner, and then close the modal window and click the preview icon again, it works perfectly. I don’t know what the issue is with IE9 and showing Google Doc View in iframe. However, if you do a quick google search on “ie google doc viewer iframe”, you will see that it may be an issue with Google Doc Viewer and IE.