Issue with visuals when updating QGridLayout inside QScrollArea

[TimeBomb]

Hey guys, I have a QGridLayout inside a QFrame inside a QScrollArea. The QGridLayout holds lots of widgets.
Each time a widget is added or removed, it runs this method:

Notes:
-TabBar is the main class; it is a QWidget
-The updateLayout method is called whenever a tab is added or removed
-tabLayoutScroller is a QScrollArea
-tabLayout is a QGridLayout inside a QFrame. The QFrame is set as the main widget for tabLayoutScroller
-tabs is a QList<QPushButton*>

void TabBar::updateLayout()
{
    tabLayoutScroller->setUpdatesEnabled(false);
 
    for(int i = 0; i < tabLayout->columnCount(); i++)
    {
        if(!(tabLayout->itemAtPosition(0, i)))
            break;
        tabLayout->itemAtPosition(0, i)->widget()->hide();
        tabLayout->itemAtPosition(0, i)->widget()->deleteLater();
        delete tabLayout->itemAtPosition(0, i);
    }
 
    QLayoutItem *child;
    while ((child = tabLayout->takeAt(0)) != 0)
        delete child;
 
    tabLayout->invalidate();
 
    for(int i = 0; i < tabs.count(); i++)
        tabLayout->addWidget(tabs.at(i), 0, tabLayout->columnCount());
 
    tabLayoutScroller->setUpdatesEnabled(true);
 
    tabLayoutScroller->update();
    tabLayoutScroller->repaint();
}

void TabBar::updateLayout()
{
    tabLayoutScroller->setUpdatesEnabled(false);

    for(int i = 0; i < tabLayout->columnCount(); i++)
    {
        if(!(tabLayout->itemAtPosition(0, i)))
            break;
        tabLayout->itemAtPosition(0, i)->widget()->hide();
        tabLayout->itemAtPosition(0, i)->widget()->deleteLater();
        delete tabLayout->itemAtPosition(0, i);
    }

    QLayoutItem *child;
    while ((child = tabLayout->takeAt(0)) != 0)
        delete child;

    tabLayout->invalidate();

    for(int i = 0; i < tabs.count(); i++)
        tabLayout->addWidget(tabs.at(i), 0, tabLayout->columnCount());

    tabLayoutScroller->setUpdatesEnabled(true);

    tabLayoutScroller->update();
    tabLayoutScroller->repaint();
}

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The problem is, if I have lots of widgets open, and I close lots of them, then open lots of them... the visuals glitch out quite a bit. See:
http://i.imgur.com/oer5q.png

This is an odd problem that I have yet to figure out. Any help is highly appreciated; thanks all.