.gif Images runs backgrounds blinks when run via kivyLauncher and runs perfectly fine in windows .

main.py

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen,FallOutTransition
from kivy.uix.image import Image
from kivy.uix.gridlayout import GridLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.core.window import Window
from kivy.graphics import BorderImage
from kivy.graphics import Color, Rectangle ,Line

#################     Images   ######################
S = Image(source='images/Stick.png')
L = 'images/spinningFly.gif'
z= 'images/level1.zip'
#################     Images   ######################

class CButtonW(BoxLayout):
    def __init__(self, **kwargs):
        print "init --> CButton self.pos is ",self.pos
        super(CButtonW, self).__init__(**kwargs)
        self.orientation = 'vertical'
        with self.canvas.before:
            Color(1, 1, 0, 1, mode='rgba')
            self.rect = Rectangle(pos=self.pos,size=self.size)
            self.I=BorderImage(pos=self.pos,size=self.size,
                    border=(10, 10, 10, 10),
                    source='images/tex.png')
        self.bind(pos=self.update_rect)
        self.bind(size=self.update_rect)
        self.add_widget(S)
        self.add_widget(Button(text="Button 1"))
        #If use this - works ok on windows - but background blinks if run y kivy launcher
        self.add_widget(Image(source=L))
        # If use this - works ok at both windows as well as in kivy launcher
        self.add_widget(Image(source=z))

    def update_rect(self, *args):
        self.rect.pos = self.pos
        self.rect.size = self.size
        self.I.pos = self.pos
        self.I.size = self.size


class LevelScreen(Screen,GridLayout):
    def __init__(self, **kwargs):
        super(LevelScreen, self).__init__(**kwargs)
        with self.canvas:
            Line(points=(10, 10, 20, 30, 40, 50))
            Color(1, 0, 1, 1, mode='rgba')
            Rectangle(pos=self.pos, size=Window.size)


        self.layout = GridLayout(cols=3,spacing=1,padding=10)
        self.Button1 = CButtonW(id='1',text='Level 1')
        self.layout.add_widget(self.Button1)

        LevelScreen.add_widget(self,self.layout)


# App Class
class MyJBApp(App):
    def build(self):
        sm = ScreenManager(transition= FallOutTransition())
        sm.add_widget(LevelScreen(name='level'))
        return sm

if __name__ == '__main__':
    MyJBApp().run()

Use any .gif image example http://www.picgifs.com/graphics/flies/graphics-flies-339574-765326/
and use any .zip files for animation