I am importing a csv file and one of the fields does not appear to be importing, but is also not generating an error message.

It is a text field and, the first time I tried it there were commas in the field in some rows, so those rows enclosed that field with double quotes. When this was just one column among several being updated, the columns before and after the column were updated and there was no indication of any problem.

When I created a version of the file where this was the only column to update, with double quotes and commas the log said "there are no new users." When I changed the commas to semi-colons in that field, so that no rows have double quotes for that field, the log says that all users were updated, but the field in D7 still appears to be empty.

If having commas in text fields in a CSV (enclosed in quotes) creates a problem for Feeds that should be addressed and/or documented.

Now that I have changed the commas within the field to semi-colons, how can I figure out why everything seems to be working (users showing that they were updated according to the log) while the field appears to remain empty?