The launcher warning says;
Your graphics card driver is out of date. Please see ~http://nydus.battle.net/wow/enus/launcher/driverupdates~ for more information. That url reroutes back to the main Blizzard page.
I ran the DirectX Diag tool. I am running an AMD Radeon HD 7800. The drivers have been checked and are current. Windows 10 says no problems found.
No issues prior to the patch.
Any thoughts would be most appreciated.