Unfortunately, we haven’t had any report about this.
Which version of the GroupWise client you are using (See Help – About GroupWise)? Please make sure to use the latest point release of the GroupWise client: http://download.novell.com/patch/finder/
May be the information in Excel/CSV file not in correct format. Can you reproduce the behaviour by creating a test CSV file? For example, you can save the information below (one entry per line) to a CSV file (*.csv) and use it as data source.