[JeffB]

If you click the broken run arrow, it lists errors. What errors show up in that box?

I'd suspect "SubVI not executable" which will take you to the vision VI. Inside that VI, you'll have another broken run arrow. What errors do you see within this VI? Clicking on "Show Error" should take you to the point this error exists in your code. This will help figure out more about what you're seeing and how we can approach a fix.