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In Java Platform Model when attemping to nest Combined Fragment frame within another Combined Fragment frame, diagram freezes and on trying to continue other elements e.g. Lifelines disappear. The diagram cannot be worked on further and the previously saved version appears to be corrupted.
should be a duplicate of fixed issue, I'll check tomorrow, you can try daily build, see http://uml.netbeans.org/downloads.html#Daily_Builds_ for details, read notes at the bottom of the page before installation
I can't not reproduce the described problem with nested combined fragment. If you're still able to reproduce with the latest daily build, please provide the specific use case or steps that cause your diagram being corrupted.
Changed the status to WORKSFORME