Hi TB303,
It may due to you have installed KB3159706 on the WSUS server, after installing KB3159706, we need to do manual steps list in the link provided by "Winfried", if not, WSUS console will crash.
If you have win10 clients, I would also recommend installing KB3095113 on the WSUS server. To support win10 clients, we need to install both KB3095113 and KB3159706.
Best Regards,
Anne
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