Can a model be salvaged without the .dmd file?

Hello, previously I had only used dm to import relational models from an existing data dictionary.
Today I started a logical model from scratch, with "engineered" derived relational model,
but could not seem to save it - save wouldn't complain but never created no .dmd nor .dmdz file.
After closing the IDE, I see i Have a subdirectory named after my model, with .localz files thereunder
(yet all suspiciously under 1k). I had also tried exporting to xmla format, but when re-opening that
it only has entities and not the relations I had declared.
It also seems to be doing a reasonable job of importing the DDL file I had saved (and to engineer
the logical model), but again I cannot seem to be able to save ?!? In this case the IDE actually crashes
when trying to save....
Does this sound familiar to anyone, can someone suggest how to best procedd?
(I am using sql developer v 3.1.0.7)

just in case somebody's puzzled as I was by the unability to save models at all, switching to the recently released stand-alone 3.1.3 release solved that problem for me on the same system (XP with a meager 2GB, perhaps that was the problem).

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