[KevinH]

Hi Becky,
Based on your testing, I just pushed the following to master:

void PluginRunner::cancelPlugin()
{
    // qDebug() << "in cancelPlugin()";
    if (m_process.state() == QProcess::Running) {
        m_process.terminate();
    }
    m_process.waitForFinished(2000);

    if (m_process.state() == QProcess::Running) {
        m_process.kill();
    }
    m_process.waitForFinished(2000);

    ui.okButton->setEnabled(true);

    ui.progressBar->setRange(0,100);
    ui.progressBar->reset();

    ui.textEdit->append(tr("Plugin cancelled"));
    ui.statusLbl->setText(tr("Status: cancelled"));
    ui.cancelButton->setEnabled(false);
}

Does this at least close all of the python windows? Any more crashes?

Combined it waits for 4 seconds to be a bit safer.