Last week we upgraded our FOSS Zimbra 5.0.7 to FOSS 5.0.18. Since that time any attempt to access shared documents in briefcase displays a http username/password dialog. Prior to the upgrade this was not the case. I checked the audit log and noticed the following during a briefcase access:

[;oip=;ua=zc lient/5.0.18_GA_3011.UBUNTU8_64;] security - cmd=Auth;; protocol=soap;
audit.log:2009-09-29 12:54:49,380 INFO [btpool0-9] [ip=;] security - cmd=Auth;; protocol=http_basic;

Has this happened to anyone else? As I have looked through the threads I haven't seen a similar issue.