If you have tried Tip # 43: Embed a pre-filtered report in an iframe lately, you may have found the results were not quite as advertised, at least in Internet Explorer.
This is because shortly after that post was published, an update to the CRM report viewer control for Internet Explorer broke the ability for reports to work in iframes. This issue only affected IE 9+. All other browsers were not affected.
This issue has been fixed in CRM 2011 Update Rollup 17 and CRM 2013 SP1/Spring ’14 update.