Hi Ken,

I tried a different folder and got the same exception. Here is the ASPX code:

<CuteWebUI:UploadAttachments runat="server" ID="MultiFileUploader"
                InsertText="Add a File"
                onfileuploaded="MultiFileUploader_FileUploaded">

<asp:Button ID="AskButton" runat="server" Text="Ask Question"
                onclick="AskButton_Click" /> 

The part of the code-behind related to the uploader:

private List<Guid> FileGuids {
            get {
                if (ViewState["Guids"] == null)
                    ViewState["Guids"] = new List<Guid>();
                return ViewState["Guids"] as List<Guid>;
            }
        }

protected void MultiFileUploader_FileUploaded(object sender, CuteWebUI.UploaderEventArgs args) {
            FileGuids.Add(args.FileGuid);
        }

 protected void AskButton_Click(object sender, EventArgs e) {
            

            // Save Files
            foreach (Guid g in FileGuids) {
                MvcUploadFile f = MultiFileUploader.GetUploadedFile(g);
                f.MoveTo(ControlPath);
            }

           
        }

I save the file GUIDs because I need to save the files when the Ask Button is clicked, not after each file is uploaded. However, I also tested moving the MoveTo method  to the FileUploaded event but got the same exception again.