Movian

If navigate in menu, when async paginator performing on page launch, then another paginator will be started.
This cause duplicates in media list, because simultaneous paginator performed on old offset.

Test code:

var cnt = 30;
function items(page, o, new_offset){
    print("offset "+ o);
    setTimeout(function(){

        for(var i = 0; i < cnt; i++) {
            page.appendItem("https://pp.vk.me/c540402/u134197174/video/l_e86e215a.jpg", 'video', {
                            title:"Item " + (o + i),
                            icon:"https://pp.vk.me/c540402/u134197174/video/l_e86e215a.jpg",
                            description:"descriptions",
                            duration:500
                        });
        }
        new_offset(cnt + o);
    }, 750);
}

new page.Route('asyncPageLoad:test:(.*)', function(page, arg1) {
    var offset = 0;
    page.type = "directory";
    page.contents = 'movies';
    (page.asyncPaginator = function loader() {
        page.loading = true;
        items(page, offset, function(new_offset){
            print("new offset" + new_offset);
            offset = new_offset;
            page.loading = false;
            page.haveMore(true);
        });
    })();
});

Repro rate 45% in this test code.
In vk plugin repro rate 80%