I'm really sorry you have lost your bookmarks.
The default installation of the portlet comes with an example embedded
H2 database. This database was included just to give a minimal effort
quick start to the application and not ever intended to be used in
anger (sorry if I did not make this clear - I know the documentation
sucks!).
If you are using the default database then simply restarting the web
application or application server (e.g. Tomcat) will wipe your
bookmarks.
If you are using a more permanent backend database (e.g. Oracle,
MySQL, PostgreSQL) then you shouldn't have this problem.
I have been using this application in production (against an Oracle
installation) there are 15000 potential users and nobody has reported
such a problem to me as yet.
Mark
--
"Paradoxically, the more time saving abstractions you are using the
more you actually have to know." - Simon Willison