I am trying to make my entire experiment with a black background and white text, thus I have set the following defaults as recommended.
/ minimumversion = "220.127.116.11"
/ fontstyle = ("Helvetica", 48pt, false, false, false, false, 5, 0)
/ screencolor = (0,0,0)
/ txbgcolor = (0,0,0)
/ txcolor = (255,255,255)
However, when I do so, the instructions appear as they should (black background, white font), but the trials and blocks appear with a black background - white dialog box - black text background - white font (see attached image). How do I get rid of the extra white dialog box?