Two patches released by Microsoft earlier this year for its Internet Explorer browser may cause some Web sites not to load properly.
The bulletins, MS05-038 and MS05-052, removed "unsafe functionality" and change how the browser handles ActiveX controls for security reasons, Stephen Toulouse, a program manager in Microsoft's security unit, wrote on Thursday on the Microsoft Security Center Response Blog.
After installing MS05-038, first published Aug. 9 on the Microsoft Download Center, Web pages containing COM (Component Object Model) objects called monikers may not work as expected.
MS05-052, published Oct. 11, added an additional check for a specific interface for ActiveX controls before allowing a COM object to run in Internet Explorer. But it also blocks some Web pages containing ActiveX controls, Microsoft said. Users who are missing certain registry subkeys may also experience problems with this patch, Microsoft said.
Microsoft has published instructions on how to resolve the MS05-038 issues at http://support.microsoft.com/kb/906294.