I have a requirement to stop application requests in case the application cannot log for certain appenders. I've implemented this with a custom StatusListener that raises java.lang.Error for this.
Starting from 1.1.7 this stopped working, because Logback catches Throwable (and not Exception) and Util.logs it and never rethrows Errors.
Swallowing Errors is usually seen as a bad habit: http://pmd.sourceforge.net/pmd-4.3.0/rules/strictexception.html - as they signal severe errors which are not possible to handle.
Pull request coming up - hope you accept it.