As described, Logos 4 crashed shortly after starting and is repeatable. Message is "The key 'SecureHiddenResourceSyncBaseUri' does not exist in the appSettings configuration section."
5635.Beta3Crash.log
When started Offline L4 came up OK and began to index TLOT which had been downloaded "Today"; which is the first time I used L4 in a number of days (update download was 59.4 MB). However, L4 still crashes when started normally.