When I click the apply button I'm redirected to the same settings page (translation file suggests that some info using 'saved' string should be displayed, but nothing happens) and the settings are reverted to default (installing plugin correctly inserts values to DB).
Enabling debug mode does not show any errors, only one notice for admin.php "Notice line 72: Undefined variable: choices", debug shows that DB is queried for SELECTs correctly (I'm not a plugin developer, but I see no point in invoking 8 separate SELECTs when $CONFIG array is already populated).
I use customized "curve" theme, but in renamed folder.
The other (enabled) plugins are: onlinestats 2.6, fav_button 1.3, keyboard_navigation 2.2, stripwheel 0.4, recaptcha 2.1.
The html5upload (1.2.6) is last in the queue, moving it to top does not solve the problem.
Other plugins (only onlinestats and recaptcha have settings) update their settings correctly.