A bit annoying but nothing major. I noticed when I was using the color picker that when I finished the dialog, the render window would pop up. I started MS Word, switched back to TG3 and used the color picker, and again, when clicking the last "Ok", the Word window popped up. I would expect the TG3 GUI to, where I initiated the color picker, to come into focus.
Anyway, it's mainly an annoyance and doesn't hurt anything, but I thought I would mention it.