Hi Bwooden,
Thanks for the reply and assistance. To answer your questions, I am running the latest versions of all software, so CSS 3.1.2 and ASA add-on 3.2.6.
Since posting the question I have however been able to resolve the issue. It turns out the problem was with the syslog data being sent from the ASA. The ASA was configured to only send logs of severity level "warning" or above (logging trap warning). After changing it to "logging trap debugging" I am now receiving data with eventtype=cisco-firewall and the dashboard views are being populated. I haven't tried it yet, but possibly an ASA severity logging level of "informational" may also populate the data.
... View more