SYMPTOMSThe preview option in the webserver result-list is not available or only for certain file types after installing Microsoft security patch KB3057839. In some cases the search suggestions do not show as well.
CAUSEThis problem may occur after rolling out Microsoft security patch KB3057839
RESOLUTIONConfirmed to be solved by a new Windows update KB3070102: MS15-061: Vulnerabilities in kernel-mode drivers could allow elevation of privilege: June 9, 2015. Please see https://support.microsoft.com/en-us/kb/3070102 for more information.