I run OSX Lion. I just tested my ward with Thunderbird (my default mail client) and Mail 5.2. It didn't have any problems loading the 62 email addresses we had for 'adults'. I know this doesn't help you, and I apologize. Could you tell us what OS you have (OSX Mountain Lion (preview)/10.8, Lion/10.7, Snow Leopard/10.6, Leopard/10.5, Tiger/10.4, Panther/10.3, Jaguar/10.2, Puma10.1, 10.0, OS 9)?