I couldn't start Logos 4.6 nor 4.6a this morning; no matter how I tried it crashed with:-
Error ID: 6207
Error detail: InvalidOperationException: kind is not a valid GuideKeyKind.
Then I remembered creating a custom Topic Guide yesterday, went into L5 and deleted "My Topic Guide". I let it sync and was able to start Logos 4 EXCEPT that the last known "good" layout it used was one I had created in L5; the one with a deliberately distinct format and totally different resolution! I'm glad it didn't contain a topic guide ...
So i'm coming back to my previous request for a distinct name for "Application Closed" layouts as I suspect the last one was used irrespective of the version that created it!
EDIT: I was thinking about posting the logs into one of the L4 forums but couldn't figure out how to phrase it e.g. "I suspect this was caused by experimenting with a new Guide somewhere". Then I thought to send the logs to Bradley, and then I remembered creating the custom Topic Guide...
BTW I finally checked the Alpha Release Notes and found this:-
Known Issues
- Loading a custom Sermon Theme or Topic guide template in 4.6 or 4.6a via a layout synced from 5.0 will cause a crash.