macOS 11 Big Sur - Setting FP.Closeable = False while FP.State == Closed gets the Close Window button stuck in the disabled state

[Jim_Kring]

I found a bug that seems to impact LabVIEW 2019 and 2020 on Big Sur (macOS 11) -- there's no problem on Mojave (macOS 10.4), from what I can tell.

Please see the attached VI for a demo of the bug.

Note: to even get LabVIEW running on Big Sur, you'll need to apply the solution/fix in this thread: macOS Big Sur: Labview crashes on launch

The issue is that setting FP.Closeable = False while FP.State == Closed gets the Close Window button stuck in the disabled state.

This affects the VI even when it's idle

The fix is to set set FP.Closeable = True while FP.State == Closed.

[Jim_Kring · Accepted solution]

Filed with NI as Bug 1200458

Here's a VI (attached) that will get a FP "unstuck"