[NTG-context] Disappearing characters in \typefile

For my current e-book project I use \typefile to import some TeX files as examples. The syntax is color coded which is very useful. Unfortunately on my screen at least the % character is in yellow so faint as to be unreadable. So I dug into the source code and discovered that the name for this color is colorprettyfour. I changed it thus: \definecolor [colorprettyfour][r=..8, g=.4,b=.2] This gives a light brown which is not pretty but at least is readable on my monitor and hopefully on others. John Culleton