Info from @Adam Davis from my thread:
This is a known issue as UE-19896.
According to NormanFoxLee here,
if you use google sheets to export the
.csv it does not receive the same
errors. Try that and see if it helps
you until we can find the root cause
of this error.
So it should be fixed in the future, and for now, as a workaround, just import your spreadsheet into Google Sheets and export .csv file from there 
That worked for me.