django-mptt children selection works on localhost but not on server

I have the same code on localhost and on server (thanks to mercurial), but it works a little bit different. I want to render category and its subcategories in template using this code:

views.py:

def category(request, category_slug):
    try:
        category = Category.objects.get(slug=category_slug)
    except:
        raise Http404
    subcats = category.get_children()

    return render_to_response('catalogue.html',
            {'category': category,
            'subcats': subcats,
    'header_template':'common/includes/header_%s.html' % flixwood_settings.CURRENT_SITE
            },
            context_instance=RequestContext(request))

template:

<div class='subcats'>
    {% for subcat in subcats %}
    {% ifequal subcat.level 1 %}
    <div class="item">
    <a href="{% url flixwood.views.category category_slug=subcat.slug %}"><img src="{% thumbnail subcat.image 66x66 %}" class="thumb"></a>
    <a href="{% url flixwood.views.category category_slug=subcat.slug %}" class="name">{{ subcat.category }}</a>
                    {{ subcat.short_description|safe }}
    <div class="clear_left">&l开发者_C百科t;/div>
    </div>
    {% cycle '' '' '<div class="clear_left"></div>'|safe %}
    {% endifequal %}
    {% endfor %}
</div>

but however this code works perfectly on localhost (subcategories are rendering right) - it doesn't work on server, and the {{ subcats|length }} returns 0. I compared values from MySQL bases on localhost and on server - they are right and inheritance should work. The funniest thing is that the same query works perfectly in manage.py shell on server.

What the hack is wrong with it?

---

The problem was solved - it was in .pyc files, which are recreating only after apache is restarted. That's why the right code in .py files didn't work.