The good news is that the problem is gone; but as most stories related to computing, the ending is a little disappointing. The issue has been described as "some kind of problem with the file system" of unknown origin, whereas the solution consisted in wiping everything out using a golden.update.zip that reinstalled the system to a factory-clean Dingo 1.11. At least now you know that, if things gets ugly, there is some magic file waiting for you.
Now everything's working fine. I restored the library from a back-up file, but for some reason the TOC of every file got lost. This I solved manually copying the .data and .content from the .edge folder that I had wisely backed-up on my own. And so it went.
Thanks for your help and support

P.S. Kudos to the entourage edge's support crew. They certainly were clear and responsive, specially taking in account the recent lack of activity that pervades the web and scares the most impressionable of us. Maybe things are not as bad as they seem