I'm having a simular issue, it started today.

Up until now this worked fine:

INSERT INTO SDSMTI_STAGING_METRICS_TRANSACTIONS

select * from OpenRowset('MSDASQL', 'Driver={Microsoft Text Driver (*.txt *.csv)}DefaultDir=E:\Uploads','select * from [InvoiceFeed_20091221.csv]')

Now I get:

Msg 7399, Level...