Solution
If your debugging buttons are not visible, or if you cannot use the probe tool, the likely cause is that one of the VI Properties (VI Setup in LabVIEW 5.x) prohibits debugging. Here are the most common reasons that the debugging buttons are not visible:
- Debugging is turned off in the VI. You can adjust this setting from File»VI Properties»Execution»Allow Debugging (VI Setup»Window Options»Allow Debugging in LabVIEW 5.x).
- The VI is marked as subroutine priority. VIs may not be debugged while they are marked as subroutine priority. A VI is marked as subroutine priority used File»VI Properties»Execution»Priority (VI Setup»Execution Options»Priority in LabVIEW 5.x).