How to reproduce: Go to http://www.godaddy.com scroll down to bottom and notice many characters are missing and repliced by question mark.
Created attachment 19475 [details] Screenshot showing the problem
Problem happens if you set default encoding to UTF-8, if you use Western Latin-1 it goes away.
This problem is not longer present in r43110 on the Mac - not sure if there is a progression, or the website changed, but without a testcase, the bug should be closed.