shib2.load prevents webdav from reading .htpasswd file

When I configure webdav in apache2 it works fine. ie. login to the secure directory from a web browser

When I install the following.....
apt-get install -y libapache2-mod-shib2 shibboleth-sp2-schemas libshibsp-dev opensaml2-tools
and it has enabled shib2.load within --/etc/apache2/mods-enabled/-- directory, I can no longer log in to folder from a web browser.

Once the details have been inputted into the web browser login box and then click the OK button it just reloads the login box.

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04 LTS
Release: 14.04
Codename: trusty

apachectl -V
Server version: Apache/2.4.7 (Ubuntu)
Server built: Apr 3 2014 12:20:28
Server's Module Magic Number: 20120211:27
Server loaded: APR 1.5.1-dev, APR-UTIL 1.5.3
Compiled using: APR 1.5.1-dev, APR-UTIL 1.5.3
Architecture: 64-bit
Server MPM: prefork
  threaded: no
    forked: yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/etc/apache2"
 -D SUEXEC_BIN="/usr/lib/apache2/suexec"
 -D DEFAULT_PIDLOG="/var/run/apache2.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="mime.types"
 -D SERVER_CONFIG_FILE="apache2.conf"

as a note this setup worked fine in 12.04.

Regards
Bernie