Please change your ClassDataLoader in 3.2 and Dev according to the following
changes:

http://www.netbeans.org/www-nbdev/msg05184.html

There is an typical example how to make this change:

Old code:
    protected void initialize () {
        setDisplayName (NbBundle.getMessage (NbmDataLoader.class,"LBL_loaderName"));
        setActions (new SystemAction[] {
                        SystemAction.get (OpenAction.class),
                        SystemAction.get (PropertiesAction.class),
                    });
        // some other code
    }

New code:
    protected void initialize () {
        // some other code
    }

    protected SystemAction[] defaultActions () {
        return new SystemAction[] {
                        SystemAction.get (OpenAction.class),
                        SystemAction.get (PropertiesAction.class),
                    };
    }

    protected String defaultDisplayName () {
        return NbBundle.getMessage (NbmDataLoader.class, "LBL_loaderName");
    }

Please don't store default actions in static variables - because of
performance.