[JeffB]

What do you mean by doesn't run properly?

If you're not getting a broken run arrow, I'd assume it'll run. But, you're not getting results you want. What would you expect? What are you getting?

Have you tried any of the debugging tools to see what values are coming out? (Probes would be a good choice here). If you probe, do you see the expected value going into and out of that function or is there something unexpected here?

As a heads up, if VIs are missing, you'd expect to see a big grey question mark instead of their icon. That's usually the best way to determine you have a dependency issue. Instead, it looks like we've got to figure out what has changed and how it has the impact you're seeing.