Where did you get the idea that the problem arose from updating ffdshow? You'd be the first one I've heard of having these problems.
There are/were two problems with the new "weightp=2" option introduced recently in x264.
1.) CoreAVC <=1.9.5, Flash Player and Apple TV are known to not support it
2.) revisions < 1342 of x264 had a buggy implementation resulting in non-compliant output which would break even more decoders, like some DXVA ones. ffdshow should be fine anyways.
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