RawImage with rendertexture problem in Safari Webplayer

Hi everyone!
I’ve just encountered a very strange problem. Basically I have in my UI a minimap done with a rendertexture passed to the gui via a RawImage component.

It works pretty much fine, except in Safari OSX webplayer. Here, the minimap doesn’t appear, or appears completely broken, like in the enclosed image (bottom right of the screen).

Could it be a bug? Or am I doing something wrong? Thanks!

Up, maybe? Is this a known bug? Is there any workaround?

I’m having a similar problem, with my minimap also built the same way. Did you ever find a solution to this?