I noticed a problem when working with Ultimate CSV. I use Simple Taxonomies for my tags. In the CSV file those fields are either "value1" or "value1, value2, value3...". The taxonomies show up in the field mapping list underneath the "CF" custom fields. However, when one of these fields has multiple values the importer creates a new tag with the display name of all of the values together.
For instance, one of my taxonomies is called "Platforms." One of the records I uploaded had "PC, Mac, Xbox 360" (which are three distinct tags in that taxonomy). The uploader created a new tag in that taxonomy named "PC, Mac, Xbox 360".
Do I need to do anything special with taxonomies?