Recently there's been a problem with viewing the online man pages in Internet Explorer, due to the W3C banning IE from accessing a DTD referred to by each man page. Without going into a long digression about Docbook, XML, DTDs, and the problems the W3C has been having, this should be fixed now - we're locally caching copies of the offending DTD and entity files. If you're still having trouble, please file a bug in Khronos Bugzilla. If this seems OK after a little soak time, the same fix will be propagated to the OpenGL ES man pages.