Details
If a view with "Visible in view" was hidden it may happen that it is no longer visible when you try to get the layer visible again via the layer control.
Solution
After using "Reset to Glabal", close the function by clicking "Back" or "Cancel" to close the Layer Visible in View dialog box.
This is a legacy dialog. Selecting "Ok" on it re-enters the application of a local mask for the view that is currently selected. It's possible this is masking the attempt to "Reset to Global" and instead, unintentionally reapplying a local mask.
As this is a legacy dialog, Cancel does not perform an undo here.
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: DRAFTING
Version: V12.0.1
Function: DRAWING/VIEW
Ref: 002-8008005