I have this issue recently. It happened because I'm using High Performance configuration in Radeon graphic Catalyst Control Centre (CCC). Yes I am using Ati Radeon graphic card. After I change into standard performance, the title bar (min,max,close) is back to normal.
I think there's some bug with Radeon and W10. Because this configuration also effecting the internet video. I can't watch any video in internet, even in tubecast app, especially with HTML5 video.
So if you using Radeons as VGA card, try to change the configuration into standard, or just click reset icon on CCC.