I had nothing but issues from the Windows 10 upgrade. It left my system horribly slow and because of that a good chunk of my programs wouldn't work right. One of them being XIV. I could log in but it was so stuttery and laggy it wasnt worth it.

I ended up doing a clean install of Windows 10 a few days later and then everything worked perfectly. I am not sure why the upgrade hated me, but perhaps a clean install will help you?