namespace IEMultiCrash
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Embedded frm = new Embedded();
            frm.ShowDialog();
            frm.Dispose();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Dynamic frm = new Dynamic();
            frm.ShowDialog();
            frm.Dispose();

        }
    }
}

The "Embedded" form contains a placed IEMulti component.
The "Dynamic" from make an instance of IEMulti dynamically:

namespace IEMultiCrash
{
    public partial class Dynamic : Form
    {
        IEMulti scn;
        public Dynamic()
        {
            InitializeComponent();
            scn = new IEMulti();

        }

        private void Dynamic_FormClosed(object sender, FormClosedEventArgs e)
        {
            scn.Dispose();
        }
    }
}