Additionally:
I get this error when I upload a file larger than 400MB.
"The process cannot access the file because it is being used by another process."
My web.config settings are:
<add key="CuteWebUI.AjaxUploader.TempDirectory" value="~/UploaderTemp" />
<add key="CuteWebUI.AjaxUploader.RewritePath" value="False" />