I have one issue I couldn't find a solution for on the forum yet. Firefox and File explorer both have semi-transparent/luminescent titlebars even though their colors are set the same as any other window.
This becomes an issue when windows overlap, since the whole titlebar becomes white and the buttons become invisible.
(Skype on the left, Firefox on the right.)
I've tried running Firefox in compatibility mode, using addons that modify the titlebar, and running explorer as a shell with blackbox over it. Sorry if there's actually a simple solution I'm missing.
Otherwise blackbox has been working great, keep it up!