tox 1.4 assumes that bold white text is visible on all terminals. With a terminal configured for dark text on a light background (black on white), this assumption means portions of tox's output is entirely invisible.
For example, messages like "py27 sdist-reinst: …" as tox does its thing to set up my environment before actually running the tests appear as blank lines.
I have worked around this by piping the output of tox through tee so the library that changes the colors assumes it doesn't have a configurable terminal on stdout, but that's a pain. I would like some way to either disable the color output entirely or control the colors so I can see the output of tox.