I am ashamed to admit I have not used Logos for probably at least a year, maybe even 2. I tried to use it tonight, and it will not open. It shows up in the menu momentarily, and then I get a "Logos quit unexpectedly, do you want to Ignore, Retry or Report?" message.
On Mac 10.12.6
Debug report attached.1581.Logos4Logs.davidw.20170928-212751.zip