Hi,
Thanks for your reply, but i have already contacted the Mfr, and here is his answer:
Installation directory (where you put Ubooquity.jar) and working directory are not necessarily the same. It depends on where you launch Ubooquity from.
Running any application in a system directory is not a good idea, your working directory should be a user directory you have created somewhere in your own files (not the OS files), and for which the user running Ubooquity has writing permission.
To do that you can either "cd" in your working directory before launching Ubooquity, or use the "-workdir" command line option: it allows you to specify where Ubooquity should create its own files (database, logs, preferences, cache, etc).
Furthermore, he says that it is not him who created the addon for Dlink...
You can find the exchanges to : http://ubooquity.userecho.com/topics/236-ubooquity-dont-save-settings/
Best regards.
Ponch.