We have just released Fretspace 1.3.1.
This fixes issues that affected Fretspace in Dark Mode: chart and box titles are drawn in black rather than white, and the appearance of toolbar icons has been improved.
This is a free update. If you bought Fretspace from the App Store, you can update from the App Store application. If you bought from us, you can download the latest version by clicking on the Try button on the Fretspace page of our website.