When I installed it on my machine, I found Enterprise Manager would fail with a memory access violation in the following scenario. New DTS Package; Add a SQL Server Connection; Pull down the Server: combo box.
1 Development box (SQL Developer Ed on Windows 2000, SP3)
1 Test box (SQL Developer Ed on Windows 2000, SP3)
1 My laptop (SQL Developer Ed on Windows XP Pro, SP1)
1 My Home server (SQL Developer Ed on Windows 2000, SP3)
I just tested the scenario you described on the Test box and the Development box and I had no issue with it. I have had issues with that drop down box in the past, but I usually associate them with the fact that my laptop is not on the domain. It takes an inordinate amount of time for that list box to populate and sometimes it doesn't populate at all.