Why won't my database model open?

Suddenly (i've been working on it a few weeks now) my database model refuses to open in JDeveloper. No error messages or anything. Dragging the model is ignored as is right clicking and choosing Open....
Any ideas?
Rakesh

Hi,
Is it possible that you could send me your project so that I can investigate? If so my email address is [email protected] Can you rename the .zip file to .zap so that it gets through the mail system.
Also can you confirm which version of JDeveloper you are using?
Was the diagram created in this release or migrated from a previous release?
What was the last sort of thing you were doing before you were unable to reopen the diagram?
Regards,
Lisa Sherriff
JDev QA

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