I'm having the same issue. My Windows 10 TP updated to build 9926 this morning. I had the RSAT tools working great in the previous build. Now, Active Directory Users & Computers is not working. AD US&C says that the MMC hasn't been configured. I have since downloaded and tried to install (WindowsTH-KB2693643-x64.msu). I get the following box when trying to install.(Windows Update Standalone Installer - The update is not applicable to your computer)
My PC is domain joined and I'm a local admin on the PC
Any help would be greatly appreciated.