When I changed logback.xml to the following, logging to console and default.log stopped when default.log exceeded max size, and log is not rolling over. All logging after that seems to go to a black hole (not console or log file).

Download rln_troubleshoot.zip and run the project. The 1st time it runs, default.log will have some entries: when I run this, the last entry I see has been "Log entry 13 to help..."

Change logback.xml entry "<fileNamePattern>" to the following, and the log works properly , rolling over and continuing logging:
<fileNamePattern>/app/cobalt/logs/localhost/default-%i.log</fileNamePattern>