Comment 3 for bug 1399246

Yes, any version which includes the clean urls and subdomains feature, and also has the PDF block. I'm not sure if there are any other content blocks featuring iFrames which will be affected?

When I came across this bug I thought that adding the main site domain to the list of allowed iFrames would fix it - it didn't unfortunately, and I haven't had a chance to look at the iFrame whitelisting mechanism. Perhaps the issue could be fixed once there instead of in every content block with an iFrame?