If you are on Ubuntu, and are having problems running WowMatrix, or are experiencing issues with missing text when running WowMatrix, please try the following steps:
1. Visit the Ubuntu Dashboard and search for Terminal, and run it.
2. In Terminal, type: sudo apt-get install libgtk2.0-0:i386
3. Wait for the installation process to complete.
And also if you're on KDE:
4. In Terminal, type: sudo apt-get install gtk2-engines-oxygen:i386
5. Wait for the installation process to complete.
You should now be able to run WowMatrix correctly. Enjoy!