First of all, regarding registry settings, noone in our office can edit registry settings, at least through regedit as it has been disabled for use across the organisation.

As far as more information:

The column I refer to has dates in. There are around 1000 rows of data. The first three rows in the particular column are empty. Then there are a few dates and the pattern sort of repeats itself like that. When the data is previewed in SSIS, the first three rows show as empty for that column but every row with a valid date in shows as "NULL".