I got the exact same issue. I create the import, import the data and everything is fine. But when I look at the syn log it states "message":"There are no mapped fields in the file 2014-09-28T14-44-04_User18_8cfb5ecd40974d1f80e48adff658d2a0.csv."
And my file only contains the email address and this is also configured in the fields definition of the import and as the identifierFieldName.
Please put an update if you find the solution
