Is there a chance you can attach a screenshot of your multitrack environment? While the overall interface defaults to dark grey, the clips in multitrack should display waveforms in color, which you can adjust per-clip or per-group in the Properties panel.
You can also adjust the default waveform color under Preferences > Appearance which will adjust the default color for clips in multitrack. When unselected, clips ARE dimmed but the waveform should remain visible in contrast over its background color.
Under preferences, there are some controls appearance which control "brightness" of the UI, there's also some selections of pre-built color schemes/shadings, including a default clip/waveform color.
Hope that helps