Запустил в Дебаггере. Узнал строку в которой это происходит. Но понятней мне от этого не стало.
void setupUi(QDialog *Dialog)
{
if (Dialog->objectName().isEmpty())
Dialog->setObjectName(QString::fromUtf8("Dialog"));
Dialog->resize(507, 561);
QSizePolicy sizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
sizePolicy.setHorizontalStretch(0);
sizePolicy.setVerticalStretch(0);
sizePolicy.setHeightForWidth(Dialog->sizePolicy().hasHeightForWidth());
Dialog->setSizePolicy(sizePolicy);
QIcon icon;
icon.addPixmap(QPixmap(QString::fromUtf8("artsfftscope.png")), QIcon::Normal, QIcon::Off);
Dialog->setWindowIcon(icon);
plotter = new QwtPlot(Dialog); // Вылетает вот в этой строке !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
plotter->setObjectName(QString::fromUtf8("plotter"));
plotter->setGeometry(QRect(0, 10, 481, 200));
plotter->setCursor(QCursor(Qt::ArrowCursor));
plotter->setContextMenuPolicy(Qt::NoContextMenu);
plotter->setAutoFillBackground(false);
plotter->setFrameShape(QFrame::NoFrame);
plotter->setFrameShadow(QFrame::Plain);
groupBox_2 = new QGroupBox(Dialog);
groupBox_2->setObjectName(QString::fromUtf8("groupBox_2"));
groupBox_2->setGeometry(QRect(10, 490, 411, 51));
filename = new QLineEdit(groupBox_2);
filename->setObjectName(QString::fromUtf8("filename"));
filename->setGeometry(QRect(10, 20, 351, 23));
selfile = new QPushButton(groupBox_2);
selfile->setObjectName(QString::fromUtf8("selfile"));
selfile->setGeometry(QRect(375, 19, 27, 27));
QSizePolicy sizePolicy1(QSizePolicy::Minimum, QSizePolicy::Minimum);
sizePolicy1.setHorizontalStretch(0);
sizePolicy1.setVerticalStretch(0);
sizePolicy1.setHeightForWidth(selfile->sizePolicy().hasHeightForWidth());
selfile->setSizePolicy(sizePolicy1);
groupBox_3 = new QGroupBox(Dialog);
groupBox_3->setObjectName(QString::fromUtf8("groupBox_3"));
groupBox_3->setGeometry(QRect(10, 440, 491, 51));
LeftCh = new QToolButton(groupBox_3);
LeftCh->setObjectName(QString::fromUtf8("LeftCh"));
LeftCh->setGeometry(QRect(310, 20, 26, 25));
label_4 = new QLabel(groupBox_3);
label_4->setObjectName(QString::fromUtf8("label_4"));
label_4->setGeometry(QRect(373, 30, 64, 20));
Cels = new QToolButton(groupBox_3);
Cels->setObjectName(QString::fromUtf8("Cels"));
Cels->setGeometry(QRect(170, 20, 26, 25));
BackGround = new QToolButton(groupBox_3);
BackGround->setObjectName(QString::fromUtf8("BackGround"));
BackGround->setGeometry(QRect(40, 20, 26, 25));
label = new QLabel(groupBox_3);
label->setObjectName(QString::fromUtf8("label"));
label->setGeometry(QRect(10, 30, 31, 18));
label_3 = new QLabel(groupBox_3);
label_3->setObjectName(QString::fromUtf8("label_3"));
label_3->setGeometry(QRect(250, 30, 57, 18));
RightCh = new QToolButton(groupBox_3);
RightCh->setObjectName(QString::fromUtf8("RightCh"));
RightCh->setGeometry(QRect(440, 20, 26, 25));
label_2 = new QLabel(groupBox_3);
label_2->setObjectName(QString::fromUtf8("label_2"));
label_2->setGeometry(QRect(120, 30, 41, 18));
stopbutton = new QPushButton(Dialog);
stopbutton->setObjectName(QString::fromUtf8("stopbutton"));
stopbutton->setEnabled(false);
stopbutton->setGeometry(QRect(430, 514, 31, 27));
QIcon icon1;
icon1.addPixmap(QPixmap(QString::fromUtf8("cr22-action-tool_pause.png")), QIcon::Normal, QIcon::Off);
stopbutton->setIcon(icon1);
startbutton = new QPushButton(Dialog);
startbutton->setObjectName(QString::fromUtf8("startbutton"));
startbutton->setGeometry(QRect(470, 514, 31, 27));
QIcon icon2;
icon2.addPixmap(QPixmap(QString::fromUtf8("cr22-action-tool_resume.png")), QIcon::Normal, QIcon::Off);
startbutton->setIcon(icon2);
right_enabled = new QCheckBox(Dialog);
right_enabled->setObjectName(QString::fromUtf8("right_enabled"));
right_enabled->setGeometry(QRect(490, 110, 16, 22));
right_enabled->setChecked(true);
left_enabled = new QCheckBox(Dialog);
left_enabled->setObjectName(QString::fromUtf8("left_enabled"));
left_enabled->setGeometry(QRect(490, 40, 16, 22));
left_enabled->setChecked(true);
groupBox = new QGroupBox(Dialog);
groupBox->setObjectName(QString::fromUtf8("groupBox"));
groupBox->setGeometry(QRect(10, 340, 491, 91));
retranslateUi(Dialog);
QMetaObject::connectSlotsByName(Dialog);
}