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Found the solution!
To remove the shared material you will need to instante the material(create a new one) and then set back to the image:...
This topic has a similar problem:
In Visual Studio 2012:
File > Advanced Save Options
In "Line endings" select "Unix (LF)"
I want to share with you guys some code to improve the Video playback on Unity.
I only tested it on a PC, but I guess this code could help...