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OP asked for possible issues and I’ve answered that I had them on Windows 8 while I didn’t on Windows 7.
I’ve also listed some feature removals in case that they might be relevant to him or others who are irresolute about whether to upgrade to 2014 or not and from my point of view, I would recommend waiting a little bit more, till the issues are resolved and/or the features might come back.
btw: I’m still waiting for a pic with the option to ignore files in Avast 2014 when a dialog message comes up with what you want to do with the file/download.