I'm not sure if this is a new issue or not. Yesterday I visited a site that had a video that is hosted at youtube within an iframe. The iframe was blank and also could not go to a page that was located in a subdomain of the main URL.
I did not have either issue when using Firefox 19.0.

I have been using IE9 on Win7 64bit for a couple of years and don't recall seeing this issue before, so I'm wondering if it might be related to the many updates in the last 'patch tuesday'.

I have IE9 reset to the default security levels. IE9 and Win7 64bit are both fully updated. I've also tried turning off firewall and anti-malware with no luck.

Has anyone else seen anything similar...or am I just going crazy??