Where to start troubleshooting when things aren't working as you expect.
/usr/local/munki/managedsoftwareupdate -vvv to get more verbose output.
By default, logs are written to
ManagedSoftwareUpdate.log is the main log; errors and warnings from the most recent run are in errors.log and warnings.log, respectively.
You can increase the amount of detail in ManagedSoftwareUpdate.log with
sudo defaults write /Library/Preferences/ManagedInstalls LoggingLevel -int 2 (higher integers for even more detail).
The Managed Software Center application runs as the user, and uses a different path, described here: https://github.com/munki/munki/wiki/MSC-Logging
When installing Apple Installer packages, Munki calls the command-line
/usr/sbin/installer tool. That tool logs to /var/log/install.log.
Munki can be configured to check for and install Apple software updates; in that case it calls
softwareupdate tool also logs to /var/log/install.log.
The Munki client talks to the Munki server via normal web protocols -- you may be able to troubleshoot by using a web browser to download the same info from the relevant URLs:
http://(yourmunkiserver)/repo/manifests/name_of_client_manifest http://(yourmunkiserver)/repo/catalogs/production http://(yourmunkiserver)/repo/catalogs/testing
Ask for help here: http://groups.google.com/group/munki-discuss