LabVIEW Crashes When Clicking Grayed Area of Scale Legend in Waveform Chart

Updated Sep 4, 2018

Reported In

Software

  • LabVIEW

Issue Details

If I click the grayed area of the scale legend of a waveform chart to add a scale using the following steps, LabVIEW crashes.
1. Place a waveform chart on the front panel without wiring anything.
2. Expand the plot legend so it shows the number of plot names that is the number of stacked plots that you want.
3. Right-click the chart and select Stack Plots.
4. Right-click the chart and select Visible Items » Scale Legend.
5. Stretch the scale legend down so it shows more (empty) y-scales.
6. Now, either click on any of the buttons in an unassigned y-scale, or type something in the scale name field and hit enter. This will crash LabVIEW and show the following crash report with an unknown exception code.

Solution

The following is a workaround to add a scale:
1. Place a waveform chart on the front panel.
2. Expand the plot legend so it shows the number of plot names that equals the number of stacked plots that you want. If you want 3 plot windows, then expand the plot legend to show 3 plots.
3. Wire a signal to the chart on the block diagram. This must be an array of signals, even if it only contains one channel. It could be an empty 2-dimensional array of doubles.
4. On the front panel, right-click the chart and select Stack Plots. You should now see multiple plot windows.
5. If you change the number of plot rows displayed in the plot legend (in edit mode), the number of plot windows changes accordingly.

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