Steps to reproduce:
1. Download and open project "5.4test.zip"
2. Open scene "Bug"
3. Enter play mode
4. See Canvas Image element flickering while y offset value is changing. See attached video "2016-03-16_780053.mov"

Expected result:
Canvas Elements not flickering while animating y offset in shine effect.

Workaround:
Change Graphics API from OpenGLCore to OpenGL2.

Notes:
The bug is only reproduced with graphics API OpenGL 4.1 or later versions. Sometimes opening project again has some effect on the bug and makes less flickering. After that closing and opening project again flickering gets worse as before. Reproduced with Macbook Pro (OSX 10.11.3, Nvidia Geforce GT 650M).

Reproduced with: 5.4.0b10
Not reproduced: 5.3.3p2, 5.3.4f1