Hello Meghan,
Firstly, Call OnScreen Load Button has nothing to do with this. Here are few things that I want you to check:
- Make sure that your "Call OnScreenLoadButton" is number one on order action sequence, then "Enter value into Field" and lastly "Call another Action Set Case dialog & New/Edit Activity>> Schedule a Follow up?_click."
- Make sure to select "Schedule a follow up ?" field while selecting a value for "Enter value into field on screen".
-After publihing ther screen, replace the tablink with the newly modified EditCase screen.
Try these options and let me know the result.
-Inder