Sorry to hear you are having issues. If you are using Diamond, than yes it will have black titlebar when you in fullscreen mode. That is by design. If you want to get the titlebar to be like Windows 7 aero look. I believe you need to mod it, you can do so by using Skinstudio. And change the MaxCaption image.
or you can try out other aero type theme from WC : https://www.wincustomize.com/explore/windowblinds/search/aero
Stardock Community Assistant.