Layout Editor is not rendering widgets during Design time

Hi,
I am new in ADF development and my page has suddenly stop rendering in Design Tab. Initially, when I was running unbounded task flow, it is just showing a blank page.
Can anybody help me in resolving this issue? I have seen Franks note on PhaseListener. I would appreciate if some one can guide me with the detailed class and how to create the same.
Parvez

Hi Timo,
Sorry for the late response and not specifying more in detail.
My Jdeveloper version is 11.1.1.6 R1.  When I ran for the first time, it was working fine. Then later on, when I was running it was opening completely blank screen.
I thought it is something to do with the permission to the task flow. I have opened web.xml and jazn-data.xml file to check and closed without tweaking these files.
Now, I was not able to open the page in the designer also. It was just showing hierarchy of all the components.
I copied the backup again and it worked. What could be the reason so that I can avoid doing this in future?
Is this related to Jdeveloper bug as I have seen on other forums highlighting this issue.

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