Weird start up 1/4 of the screen with big pixels

Before loading the screen in wich you pick the user, a 1/4 of the screen show you big pixels as if there was a major crash on the system but then after a few seconds goes away back normal -.-

Retina display support has been around in Flash Player for a long time at this point, and this issue is not reproducing for me on my retina macbook pro with either the generally available or ESR version of Firefox.  This really sounds like an issue with GPU drivers, and it's probably specific to the particular model that you're using.
You can verify this by temporarily disabling hardware acceleration.  It's described in the troubleshooting guide, here: Video playback issues
If disabling hardware acceleration fixes it temporarily, please follow the directions in the troubleshooting guide about copying and posting the relevant system info. I'll try and hunt down an equivalent machine and get someone to triage it.  It will probably mean that we just end up filing a bug with Apple on the issue and/or blacklisting that particular driver/card combo until a patch is available, but we're happy to do that.
Also, not all YouTube videos are encoded the same way.  A direct link to a video that demonstrates the problem (and any specifics, like quality settings or full-screen vs. embedded) would be helpful.  I'm definitely not seeing this on the handful of videos I sampled, and this machine is my daily driver...
Out of curiosity, does it reproduce both when the machine is plugged in and on battery?  Some of the machines have two graphics chipsets, and switch to the lower powered ones when on battery.

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