I have a couple of laptops that I updated with latest Windows patches. Now those workstations have problem with wireless on ZS. They connect locally. I can search and connect to ZS, but I cannot reach internet.
My ZS is a router and firewall. I did not make any changes. Other devices (TV, IPad) do not have problems with connection.
I also have a second AP in the house and it works. This second AP is connected to my ZS. As a way around, I connected laptops to that second AP. This is the only stable way to connect updated laptops to the internet.