here is my dilemma. if i just use two Labels() and the code from the screen manager docs, everything is beautiful. if i comment-out everything but a single label from each of my 2 python files, only the one that is imported first will show.

gistfile1.txt

import kivy
from kivy.uix.label import Label
from kivy.config import Config
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang import Builder
import studentListview2
import Layout_master6

kivy.require('1.7.1')
Config.set('graphics', 'width', '1280')
Config.set('graphics', 'height', '720')


l= Builder.load_file('Layout_master6.py')
m=  Builder.load_file('studentListview2.py')


#sm.switch_to(screens[1])
sm = ScreenManager()

#l= Label(text='1')
screens[0].add_widget(l)
#m= Label(text='2')
screens[1].add_widget(m)
sm.switch_to(screens[0])
# later

# default :data:`ScreenManager.transition` is a :class:`SlideTransition`.
# options are `direction` and `duration`
sm.switch_to(screens[1], direction='right')

class screensApp(App):

    def __init__(self, **kwargs):
        super(screensApp, self).__init__(**kwargs)

    def build(self):
        return sm