Data Modeler bug? - it keeps reporting missing physical model files

Hi,
I'm having a rather serious problem with the latest data modeler, Oracle SQL Developer Data Modeler 3.1.4.710. It keeps losing physical model files for some reason.
I started to notice that it was not generating all the tables in my small design. After hours of struggle I found multiple error messages in the log file:
2012-12-18 10:51:20,126 [Thread-71] ERROR XMLTransformationManager - Unable to load object from XML: C:\cygwin\home\Brian\codebase\models\data\Design\rel\395D160B-C7224B8EAD05\phys\D9582E4E-2ED963CB9D32\View\seg_0\A555DB9B-8864-9C0B-DCA8-BAC5231F55C6.xml
java.io.FileNotFoundException: C:\cygwin\home\Brian\codebase\models\data\Design\rel\395D160B-C7224B8EAD05\phys\D9582E4E-2ED963CB9D32\View\seg_0\A555DB9B-8864-9C0B-DCA8-BAC5231F55C6.xml (The system cannot find the path specified)
     at java.io.FileInputStream.open(Native Method)
     at java.io.FileInputStream.<init>(FileInputStream.java:138)
     at oracle.dbtools.crest.model.metadata.XMLToObjectTransformer.transformToObject(Unknown Source)
     at oracle.dbtools.crest.model.metadata.XMLToObjectTransformer.transformToObject(Unknown Source)
     at oracle.dbtools.crest.model.metadata.XMLTransformationManager.transformFromXMLToObject(Unknown Source)
     at oracle.dbtools.crest.model.metadata.XMLTransformationManager.openPhysicalModel(Unknown Source)
     at oracle.dbtools.crest.model.metadata.XMLTransformationManager.openPhysicalModel(Unknown Source)
     at oracle.dbtools.crest.swingui.browser.BrowserPanel$88.run(Unknown Source)
These messages appeared every time I opened my physical model (Oracle 10g).
After deleting and recreating the physical model the problem went away for a while. But after closing and reopening the design I started to see the errors again.
Has anyone seen something similar?
Regards,
Brian

Thanks Philip!
The workaround does the trick for the tables, primary keys and unique keys.
I have just observed that table level constraints show a slightly different behaviour.
Names show up like TCC5, TCC6, etc.
Seems the same problem as previously in SQL*Modeler forgets check constraint names
Is there a workaround for that problem too ?
I already noticed that there is no parameter NameChanged for a table constraint.
Enrico

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Hi Philip,
sorry for not answering quite a time ...
Just some prerequisites ;-) ...
- Target database: Oracle 10g R2 (10.2.0.4)
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- OS WindowsXP German, SP3
- JDK Sun Java 1.6, build 1.6.0_16-b01
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My bad - I only checked "DDL preview" of the table, which doesn't show the ARC trigger. The complete generation does. Sorry.
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Please excuse a newbie blush.
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