This is just to help document for the devs working on the issue.
Logos version 6.6.x (sorry, I didn't copy down the full version number before reinstalling to now 6.7).
Mac OS 10.9.5
Logos would bounce one time in the Dock and then stop. No error messages or anything.
Attached is the log file from the Logging Utility.
Downloading the latest from the site and "installing" over the old one in the Applications folder resolved the issue.
1373.LogosLogs.jbolin.20151113-110725.zip