Solid Color Tunnel in Diagram Disable Structure While No Wire Connection

Updated Jan 8, 2026

Reported In

Software

  • LabVIEW

Issue Details

I am designing a LabVIEW code for my application and found that when Diagram Disable Structure is used, even without wire connection, its output tunnel remains solid colour. 

I also observed that when the VI with this issue is saved, when it is opened, the following error will prompt:

LabVIEW: (Hex Ox1) An input parameter is invalid. For example if the input is a path, the path might contain a character not allowed by the OS such as ? or @.

An error occurred loading VI 'bug.vi'.
LabVIEW load error code 3: Could not load front panel.

Is this an expected behaviour? Below is an example of my block diagram:


 

Solution

This is a bug for LabVIEW 2025 Q3. To resolve this issue, kindly install LabVIEW 2026 Q1.