It is certainly not doing the load it is supposed to do. I wonder if it is reacting badly with another source. Did you try it in a new scene with nothing except the text source for the Lyrics? Attached is my latest copy of the lyrics script that I am using. If I can get it to duplicate your issue here I can fix it pretty quickly. What did you mean by "clicking back and forth between text source and load source"? I am trying that to see if I can get it to crash. The script attached has some timer callback protections that might help that on your computer. I can also try some other guesses as to what it might be and add diagnostics to a new script to run on your computer.