VTunedisplays unreadable text in the graphical user interface on a macOS* host system.
Running the X11* version of XQuartz* on a macOS system caused the text in the
VTunegraphical interface to appear garbled and unreadable. The problem is related to the XQuartz X11 server performing font anti-aliasing, even in 256 color mode.
Reset the XQuartz preference to "millions" of colors and restart XQuartz.