No process is associated with this object - webform or vb class: asp.net, vb.net, IIS, webforms

No process is associated with this object - webform or vb class

I have been searching on this error and cannot find any solutions that come close to discussing my issue. I'm not sure if I should be looking to modify the webform or the dll.
I have a simple asp.net web form that calls a vb library class. They are in separate projects but part of the same solution.
The class file in turn runs an executable with passed in parameters and waits for the exit code which is passed back up to the web form to indicate success or failure.
StartProcess.aspx <==> RunDJClass.vb <==> djengine.exe
All components are on the same server.

It was working fine until last week. Now I get the following error -

[InvalidOperationException: No process is associated with this object.]
System.Diagnostics.Process.EnsureState(State state) +493
System.Diagnostics.Process.get_HasExited() +49
System.Diagnostics.Process.EnsureState(State state) +339
System.Diagnostics.Process.get_ExitCode() +15
RunDJClass.RunDJEngine.RunDJProcess(Object EDIProcess, Object EDIProcessAddress, Object BusinessSeparationId, Object i5EDI) +1157
FrontEnd.TestDJClass.Button1_Click(Object sender, EventArgs e) +130
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108

The error occurs when the web form calls the class RunDJClass library which contains the RunDJEngine class which contains the RunDJProcess routine...

Imports RunDJClass
-----------------------
mRunDJEngine = New RunDJEngine
mRunDJEngine.RunDJProcess(EDIProcess, EDIProcessAddress, BusinessSeparationId, i5EDI) <BANG>

Can anybody let me know where I should start to look? Form or vb object? Code posted on request.

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OK - more information would help!
EDIProcess is a string parameter (1 of 4 parameters) passed in as shown in the code snippet. This is run when the user clicks a button to run the process.

The RunDJClass module has a System.Diagnostic.Process object named djEngineProcess thus

Friend WithEvents djengineProcess As System.Diagnostics.Process
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.djengineProcess = New System.Diagnostics.Process
'
'djengineProcess
'
Me.djengineProcess.StartInfo.FileName = "C:\Program Files\Pervasive\Cosmos\Common800\djengine.exe"
End Sub

The RunDJProcess sub inside the class runs the djengine.exe file

EDIProcess = "-v " & EDIProcess
djengineProcess.StartInfo.Arguments = EDIProcess
djengineProcess.Start()

EDIProcess is a very long string. However if we run it manually in DOS the djengine exe runs fine. For example (EDIProcess value in bold)

C:\Program Files\Pervasive\Cosmos\Common800>djengine -v -d -mf "C:\Documents and Settings\All Users\Documents\DataJunction\MacroFile\macrodef.xml" "C:\Documents and Settings\All Users\Documents\DataJunction\Projects\BoF UDF EDI\UDF_To_EDITAPE_Front_End\Maps\i5_EDI_BOF_conversion.ip.xml"

    Private Sub RunProcess()
        Dim BusinessSeparationId As String
        Dim EDIProcessAddress As String
        Dim EDIProcessSourceAddress As String
        Dim EDIProcessNaming As String
        Dim i5EDI As Boolean
        Dim SourceFile As String = Submit1.Value
        Try
			'''''
	    	' business code to assign values to string variables goes here
			'''''
            Dim EDIProcess As String = EDIProcessAddress & BusinessSeparationId & EDIProcessNaming
 
            Label1.Text = EDIProcess
            EDIProcess = """" & EDIProcess & """"
            ' copy source file to specific cedant EDI source folder
            FileCopy("D:\Data\wwwroot\FrontEnd\Data\" & SourceFile, EDIProcessSourceAddress & SourceFile)
 
            mRunDJEngine = New RunDJEngine
 
            mRunDJEngine.RunDJProcess(EDIProcess, EDIProcessAddress, BusinessSeparationId, i5EDI)
 
            btnStartEDI.Text = SourceFile
            lblRunDJ.Visible = True
 
        Catch ex As Exception
            lblRunDJ.Visible = True
            lblRunDJ.ForeColor = Color.Red
            lblRunDJ.Font.Size = New FontUnit(FontSize.Smaller)
 
            lblRunDJ.Text = ex.Message & " TRACE: " & ex.StackTrace & " SOURCE: " & ex.Source & " INNER: " & ex.TargetSite.Attributes
        End Try
    End Sub

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No process is associated with this object - webform or vb class

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