I am using Stardock Curtains with the version 1.1 BETA. In most cases, it is working without problems – with exception of the transparency effects (if selected).

And I am missing a feature that enables transparency in title bar with blur effect like in the following example (screenshot was taken under Windows 8.1 with activated Aero Glass for Win8.1+ v1.5.3) using accent colors of the operating system for the title bar background:

Missed title bar feature : Blur effect for background colors (including accent colors in combination with gradients):

With Curtains under Windows 10 it is possible to combine a gradient within the title bar background with the accent color of the operating system easily. On the contrary, I did not have understood how to add the transparency effect in a unfailing manner. So, in the next screenshot example, the defined gradient is ok, but there is no transparency in the title bar background colors, although the transparency setting is done.

Title bar with a modified gradient of the style “Crystal” by Stardock, but without transparency (hint: in the original – un-changed – style the transparency effect is present, but very weak):

Style settings: