I'm getting the same error message since the update: An error occured running the Unity content on this page. See your browser's JavaScript console for more info. The error was:
Assertion failed: s_GlobalMetadataHeader->sanity == 0xFAB11BAF, at: /Applications/Unity-5.4.0/Unity.app/Contents/il2cpp/libil2cpp/vm/MetadataCache.cpp,154,Initialize at jsStackTrace@blob:https://hyperhippo.ssl.hwcdn.net/366c9e9f-94c4-4636-ab1a-5d1507e69cc6:1:22724
stackTrace@blob:https://hyperhippo.ssl.hwcdn.net/366c9e9f-94c4-4636-ab1a-5d1507e69cc6:1:22910
___assert_fail@b
That's really bizarre, sorry about that! We haven't had those kinds of issues with it yet but I'll ask around just in case anyone would have an idea. We had found that updating a browser helped when someone here was having issues with Firefox, for example, but no one's had Chrome issues yet.
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 "Aztec Stones"){kind=icon}
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It does save progress..