Rendering issue with Deflectouch / Kivy on Ubuntu 11.10

[tadeck]

The recent version of Deflectouch behaves on Ubuntu 11.10 as visible on this screenshot:

When you begin the game, the first level is generated partially. With each new level only part of the screen is updated. When you move the cannon, the position of targets on the same height (number of pixels from the top) seems to be revealed and they seem to be correctly rendered.

On Ubuntu 11.10 (Unity 2D) only graphic is an issue, sound and buttons work fine.