If you get this yellow bar

There are cases where you don't want to be prompted on this problem.

To fix this issue navigate to Tools | Internet Options | Security | Custom level

Under Miscellaneous | Display mixed content change from 'Prompt' to "Enable"

Click OK.

Reference

http://social.technet.microsoft.com/Forums/en-US/ieitprocurrentver/thread/30c0c726-4286-417b-96ea-d1bccfdb4eaa