TextEdit has the possibility to set the background to dark, then set the text color to white, and you can also speak the text if you want.

I have added a "contrast adjust" actor because the TextEditor background appears not totally black in Isadora. 

if you can work with a second monitor for TextEditor it is very confortable

TexEdit:

Best regards, 

Jean-François 

@eva

If none of the information in my previous comment is of any use to you in terms of diagnosing what issue you're having, it would be very helpful if you could attach a screenshot of what you see in the video preview when you hover your cursor over each of the links in these actors like this:

This way we can see what is happening at what step and actually deduce what might be going wrong. With the current screenshots we can only tell what two different final results look like but we don't know what your content looks like originally nor at any of the steps before the final output.