If you experience repeated crashes or an unstable behaviour when using QtiPlot, please perform the following steps:
1. Completely remove QtiPlot from your computer. On macOS, for example, you can achieve this by moving the QtiPlot icon from the Applications folder to the bin.
2. Reinstall QtiPlot using the latest installer available for your chip (Intel or Apple Silicon, 32-bit or 64-bit).
3. Reset the user preferences. This can be done directly from the user interface, by opening the Edit | Preferences dialog and pressing the Default options button.