Unable to create new flow rules for either inbound or outbound SR in FIM portal. This appears to be non-OS specific.
This is because of issue with MS14-080 cumulative security update for IE: December 9, 2014. From KB 3008923:
Known issues with this security update
Issue 1 We are aware of some reports of functional issues on sites that use nested modal dialog boxes on Internet Explorer 11 that occur after you install this security update. To resolve this issue, install update 3025390. For more information, click the following article number to view the article in the Microsoft Knowledge Base: