MSMQ message sent, but not read

Hi,

I have 2 forms ('test' and 'frmStart') which communicate with each other through MSMQ messaging. Test opens frmStart, which sends a message back when it's loaded. The problem is that the message is only read by test once frmStart is closed. I know this because when the message is read, a msgBox pops up, and this pops up when frmStart closes.
Can anyone help me with this problem?


*** the load handler in frmStart ***

VB Code:

' The form is loaded, the labels are filled with texts from the message
    Private Sub frmStart_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Try
            ' request info
            fd.sType = "request"
            fd.sLabel = "licenseInfo"
            submit(sReturnProcessID)
 
            sProcessID = sFormProcessID
            thMonitorMessageQueue.Start()
 
            'communicator = sender
            Me.cbAccept.Checked = False
            bShutdown = True
        Catch ex As Exception
            ErrorSystem.cfHandleError(ex)
        End Try
    End Sub

*** the submit sub ***

VB Code:

' Function to submit a message to the queue
    Public Sub submit(ByVal recieverMessageID As String)
        Try
            ' A new message is made
            Dim msgContent As New Assimilator.SDK.Communicator.Messages.MSMQCOntent
            ' the message is given a new ID and a label
            msgContent.msgID = recieverMessageID
            msgContent.msgProcessID = recieverMessageID
            msgContent.msgLabel = fd.sLabel
            ' The message type is given as a string.
            msgContent.msgType = fd.sType
 
            ' The ArrayLists with the parameters.
            msgContent.msgFieldNames = New ArrayList
            msgContent.msgFieldValues = New ArrayList
 
            ' All the parameters are put into the message. 
            If bParameters Then
                For iCounter As Integer = 0 To alNames.Count - 1
                    msgContent.msgFieldNames.Add(alNames(iCounter))
                Next
                For iCounter As Integer = 0 To alValues.Count - 1
                    msgContent.msgFieldValues.Add(alValues(iCounter))
                Next
            End If
            ' The message is submitted
            msg.Submit(msgContent)
        Catch ex As Exception
            Assimilator.SDK.ErrorHandler.ErrorSystem.cfHandleError(ex)
        End Try
    End Sub

*** msgEvent handler in test ***

VB Code:

Private Sub MsgEventHandler(ByVal msgContent As Assimilator.SDK.Communicator.Messages.MSMQCOntent) Handles msg.msgEvent
        Try
            Me.Show()
            Select Case msgContent.msgType
                Case "result"
                    ' Code to simulate Communicator opening / bringing form to front
                    frm = New frm
                    fd.sForm = msgContent.msgFieldValues(0)
                    Select Case fd.sForm.ToLower 'msgContent.msgProcessID
                        Case "frmstart"
                            frm = New frmStart
                        Case Else
                            ' If no correct formName is given, the user gets this messageBox.
                            MsgBox("Sorry, an error has occured. The right form could not be loaded. --> test.vb <--")
                    End Select
                    frm.sReturnProcessID = sProcessID
                    Me.DialogResult = DialogResult.OK
                Case "request"
                    MsgBox("request recieved")
                    Me.DialogResult = DialogResult.OK
            End Select
            ' Code to populate request message with info of objects on screen
        Catch ex As Exception
            ErrorSystem.cfHandleError(ex)
        End Try

*** frmStart closes ***

VB Code:

' This happens when the window closes.
    Private Sub frm_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) _
    Handles MyBase.Closing
        Try
            bShutdown = True
        Catch ex As Exception
            ErrorSystem.cfHandleError(ex)
        End Try
    End Sub