First problem - SharePoint 2013 Management Shell GONE.
Second problem - Manage Services link in CA GONE - but oddly on the WFE (shows up when CA access from the Application Servers).
Third problem - Security Token Service FAILS.
Fourth problem - Sites cannot be created (all return 500).
My suggestion, DO NOT INSTALL THIS CUMULATIVE UPDATE. I think its pretty poor testing to release this to the public - You'd think Microsoft would have learned from FileNet - moving all development to India means quality is taking a nosedive.