Change the color of a Group Frame title?

Yes it is possible, just check the figure below:)

Oh, I didn’t see that one. Thanks.

There seems to be a bug, however. As seen on the attached image, the chosen color is black but the text color is blue…

It is a designed behavior. If you use the default text color (black), the UI theme will use the preferred text color for group frame, in Windows XP theme, that’s blue.

So that means that – when running the XP theme – I can’t have black Group Frame header – but only dark gray?

However you can set the color very close to black, like #010101.