http://www.techradar.com/news/meltdown-and-spectre-windows-patch-halted-for-amd-pcs-after-it-causes-boot-failure

At CES, Intel may have been keen to insist that the whole Meltdown and Spectre fracas will be largely put to bed by the end of next week, but it appears more havoc is being caused right now, with Microsoft’s Windows patch aimed at tackling the flaws causing AMD-powered PCs to stop booting up.

This is only affecting some AMD machines, but clearly enough have been hit, because Microsoft has made the decision to halt patching AMD PCs in order to resolve the problem.