Screen tearing in secure guest mode

Just got a new rMBP, 15" (no discrete GPU), 2.3GHz. Slowly installing stuff I want on it and I enabled FileVault. Once it was done, I restarted again and to check out the guest mode.
When Safari started up, it went into a semi seizure-inducing state. Going to the Yahoo homepage caused a LOT of screen tearing. Very noticeable on the scrollbars and anything with anything animated. Yet when I restart and log in as normal and go to the same page with Safari there were no rendering problems at all.
I have reset the PRAM/NVRAM and all updates are installed from the App Store.
Has anyone else experienced this? Is this likely to be a hardware problem or a software problem (gfx driver issue in safe mode)?
Thanks
Chris

Yep that "fixed" it. Very surprised that made it past QA.
I'd rather than have Filevault on than a working guest login.
Chris

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