Also this might come handy at some point: "Financial data from Quandl in Wolfram Language using QuandlLink"
http://community.wolfram.com/groups/-/m/t/540228
I have the same problem but was able to get the data via WolframAlpha e.g. WolframAlpha["APPL close Nov 4 2016 to Nov 6 2017"]
You're right we're working to get an update to FinancialData pushed out as soon as possible that will restore those basic calls and others that are currently failing.
