I'm exploring EXM 3.4 on an 8.2 rev. 160729 instance and for a simple test mail I imported an existing CSV file which threw constantly an error about an empty listId.
Then I manually created a new list and created a contact in the ListManager application. Now the list is being built but never completing. The message it displays is 'Currently building list. Contacts will be viewable when complete".
Please note that this list is currently being built and is locked. Please note that contacts in the list are currently being indexed, so not all contacts are available to view at this time. 1 out of 1 contacts are currently indexed.
Any ideas where it might be stuck? I don't see anything special in the log files.