I have customizaed my workspace with Flex Builder 3, Flex SDK 2 Hotfix 3. In previous months, everything is ok, and my workspace with IE 7.0 can open PDF forms inside processes. However, I do not know what is changed, my previous customized workspaces and new customized workspace can not open PDFs inside IE, but works on Mozilla Firefox. I have also tested workspace source without changing anything and deploying my server. However it still can not open PDFs, blank part is shown inside the PDF frame.
Error Message: 'undefined' is null or not an object