after logging in with the Web Client set to "Mobile" I see an Internal Server error.
Digging in /opt/zimbra/logs/mailbox.log I found the following Error Message
causing the internal Server Error.
webclient - local exception com.zimbra.cs.taglib.bean.ZTagLibException: no such file: /opt/zimbra/jetty-6.1.15/work/zimbra/jsp/org/apache/jsp/tag/web/mobile/moDisplayMessage_tag.class ExceptionId:btpool0-5:1255455267998:71fb779f0446bd7d
Purging the /opt/zimbra/jetty/work directory and restarting mailboxd did not help.
Has anyone seen this error before?