I'm getting a "System.Security.SecurityException: System.Security.Permissions.SecurityPermission" error when trying to import a Visio VDX file from my website (works great locally).

I'm using a fileUpload control to save the file to a folder (with read/write) and then trying to import it. File saves ok but as soon as it tries to import, I get the error.

Protected Sub btnUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUpload.Click
        Dim sFName As String = Server.MapPath("~\") & "VisioVDX\" & uplFileName.FileName
        lblFName.Text = sFName
        uplFileName.SaveAs(sFName)
    End Sub


Protected Sub btnImportVisio_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnImportVisio.Click
        Dim v As New VisioImporter
        If lblFName.Text.Trim <> "" Then
            v.ImportAllPages(lblFName.Text, dgvMain.Diagram)
        End If
    End Sub
 

Site is hosted at GoDaddy which has Med. Trust Level set. No idea how to change it.

I copied the files to the bin folder on the server and still get the same error.

Try setting importer.SuppressUnmanagedCode before calling Import() with this version:
https://mindfusion.eu/_beta/netdiag_unmg.zip