first example Window displays what is behind it.

[Sam Oberholtzer]

Hi,
I tried to run the first example on Ubuntu 14.04 and the window drew, but displayed what was on the screen behind it (see attached) instead of the intended label.
I understand the errors are related to my multi-touch devices, but that doesn't explain the display issues.

[INFO   ] [Logger      ] Record log in /home/sam/.kivy/logs/kivy_17-06-17_2.txt
[INFO   ] [Kivy        ] v1.9.1
[INFO   ] [Python      ] v3.4.3 (default, Nov 17 2016, 01:08:31)
[GCC 4.8.4]
[INFO   ] [Factory     ] 179 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2, img_pil (img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: sdl2
[INFO   ] [OSC         ] using <multiprocessing> for socket
[INFO   ] [Window      ] Provider: sdl2(['window_egl_rpi'] ignored)
[INFO   ] [GL          ] OpenGL version <b'3.0 Mesa 10.1.3'>
[INFO   ] [GL          ] OpenGL vendor <b'Intel Open Source Technology Center'>
[INFO   ] [GL          ] OpenGL renderer <b'Mesa DRI Intel(R) Broadwell '>
[INFO   ] [GL          ] OpenGL parsed version: 3, 0
[INFO   ] [GL          ] Shading version <b'1.30'>
[INFO   ] [GL          ] Texture max size <8192>
[INFO   ] [GL          ] Texture max units <32>
[INFO   ] [Window      ] auto add sdl2 input provider
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO   ] [ProbeSysfs  ] device match: /dev/input/event10
[INFO   ] [MTD         ] Read event from </dev/input/event10>
[INFO   ] [ProbeSysfs  ] device match: /dev/input/event7
[INFO   ] [MTD         ] Read event from </dev/input/event7>
[INFO   ] [Base        ] Start application main loop
[INFO   ] [GL          ] NPOT texture support is available
 Exception in thread Thread-2:
 Exception in thread Thread-1:
 Traceback (most recent call last):
 Traceback (most recent call last):
   File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner
   File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner
     self.run()
     self.run()
   File "/usr/lib/python3.4/threading.py", line 868, in run
   File "/usr/lib/python3.4/threading.py", line 868, in run
     self._target(*self._args, **self._kwargs)
     self._target(*self._args, **self._kwargs)
   File "/usr/lib/python3/dist-packages/kivy/input/providers/mtdev.py", line 219, in _thread_run
   File "/usr/lib/python3/dist-packages/kivy/input/providers/mtdev.py", line 219, in _thread_run
     _device = Device(_fn)
     _device = Device(_fn)
   File "/usr/lib/python3/dist-packages/kivy/lib/mtdev.py", line 131, in __init__
   File "/usr/lib/python3/dist-packages/kivy/lib/mtdev.py", line 131, in __init__
     self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
     self._fd = os.open(filename, os.O_NONBLOCK | os.O_RDONLY)
 PermissionError: [Errno 13] Permission denied: '/dev/input/event7'
 PermissionError: [Errno 13] Permission denied: '/dev/input/event10'

Thanks for any help,
Sam