Okay, try this. Create a macro just for matching the 7x8 white image on your Easyworship display. Maybe call this macro "White Pattern". This macro wont have an action added.
Now create a macro titled "Text Slides". Set it to "If" "Macro", with a condition type of "State" and condition of "White Pattern" is true. Check the "Perform actions only on condition change" box. Add a "Scene item visibility" action. Select the scene, then "Show", "Source", and select your Easyworship source.
Create another macro named "Black Slide". Set it to "If not" "Macro", with a condition type of "State" and condition of "White Pattern" is true. Again check the "Perform actions only on condition change" box. Add a "Scene item visibility" action. Select the scene, then "Hide", "Source", and select your Easyworship source.