Not sure what is happening this month with the August releases of patches by Microsoft. There have already been two other known issues caused by a few security patches, Microsoft patches KB3177725 & KB3176493 causing printing issues and Microsoft Patch KB3179575 causing authentication issues with Windows 2012 servers. They have released a fix for the printing issue problem (KB3187022), but we havent had any correspondence regarding the authentication issues.
Anyway, another issue has popped up, KB3176934 which seems to break Windows 10 Powershell, particularly the Desired State Configuration (DSC) functionality in PowerShell. Again, as with the other two updates prior, the only way to fix this issue is to uninstall KB3176934 from effected machines.
The issue is due to a missing .MOF file in the build package which causes the update to break DSC. All DSC operations will result in an “Invalid Property” error. If you are using DSC from or on any Windows client, uninstall this update.