I've logged all transactions on PostgreSQL and we can see that when you login with another language than Default, the password is updated :

2012-11-16 03:44:39 EST LOG: instruction : UPDATE "lime_users" SET "uid"=1, "users_name"='admin', "password"='Resource id #65', "full_name"='Administrator', "parent_id"=0, "lang"='fr', "email"='your-email@example.net', "create_survey"=1, "create_user"=1, "participant_panel"=1, "delete_user"=1, "superadmin"=1, "configurator"=1, "manage_template"=1, "manage_label"=1, "htmleditormode"='default', "templateeditormode"='default', "questionselectormode"='default', "one_time_pw"=NULL, "dateformat"=1 WHERE "lime_users"."uid"=1

I don't really know what 'Resource id #65'.

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=10324

Tested. It works thanks

New version 2.00+ Build 121116 released

Fix committed to 2.1 branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=10329

Re-opened because a user on the IRC reported this to show up at build 121121.

Hi !

The issue is back since this line has been added :
return parent::beforeSave();

Commit fbc4ed63ecad6ae2cc2485b66099e0e3fea9498d is the problem.

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=10429

Just for reference:

The cause is a Yii issue

https://github.com/yiisoft/yii/issues/1181
Can read but not save binary data (e.g. BYTEA) in version 1.1.11

The linked Yii issue does not fix the problem. Will leave it in for now anyway.

Fix committed to 2.1 branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=10457

New 2.00+ build released.