I noticed the same messages in my user.log.  I don't have libacr* installed.

uname -a
Linux pecan 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 18:40:08 UTC 2009 i686 GNU/Linux

user.log
Sep 12 09:40:44 pecan pulseaudio[16319]: module-x11-xsmp.c: X11 session manager not running.
Sep 12 09:40:44 pecan pulseaudio[16319]: module.c: Failed to load  module "module-x11-xsmp" (argument: ""): initialization failed.
Sep 12 19:17:01 pecan pulseaudio[16319]: module-console-kit.c: GetUnixUser() call failed: org.freedesktop.DBus.Error.UnknownMethod: Method "GetUnixUser" with signature "" on interface "org.freedesktop.ConsoleKit.Session" doesn't exist
Sep 13 03:00:01 pecan pulseaudio[16319]: module-console-kit.c: GetUnixUser() call failed: org.freedesktop.DBus.Error.UnknownMethod: Method "GetUnixUser" with signature "" on interface "org.freedesktop.ConsoleKit.Session" doesn't exist
Sep 13 08:17:46 pecan pulseaudio[3489]: module-x11-xsmp.c: X11 session manager not running.
Sep 13 08:17:48 pecan pulseaudio[3489]: module.c: Failed to load  module "module-x11-xsmp" (argument: ""): initialization failed.
Sep 13 14:27:35 pecan pulseaudio[3325]: module-x11-xsmp.c: X11 session manager not running.
Sep 13 14:27:36 pecan pulseaudio[3325]: module.c: Failed to load  module "module-x11-xsmp" (argument: ""): initialization failed.
Sep 14 07:07:41 pecan pulseaudio[3328]: module-x11-xsmp.c: X11 session manager not running.
Sep 14 07:07:43 pecan pulseaudio[3328]: module.c: Failed to load  module "module-x11-xsmp" (argument: ""): initialization failed.
Sep 14 08:03:09 pecan pulseaudio[3328]: alsa-util.c: Cannot find fallback mixer control "PCM" or mixer control is no combination of switch/volume.
Sep 14 08:03:09 pecan pulseaudio[3328]: alsa-util.c: Device hw:1 doesn't support 2 channels, changed to 1.
Sep 14 08:34:34 pecan pulseaudio[3328]: module-combine.c: Assertion '!op->outq_rtpoll_item_read && !op->inq_rtpoll_item_write' failed at modules/module-combine.c:691, function sink_process_msg(). Aborting.
Sep 14 13:59:19 pecan pulseaudio[3559]: alsa-util.c: Cannot find fallback mixer control "PCM" or mixer control is no combination of switch/volume.
Sep 14 13:59:19 pecan pulseaudio[3559]: alsa-util.c: Device hw:1 doesn't support 2 channels, changed to 1.
Sep 14 13:59:33 pecan pulseaudio[3559]: module-x11-xsmp.c: X11 session manager not running.
Sep 14 13:59:33 pecan pulseaudio[3559]: module.c: Failed to load  module "module-x11-xsmp" (argument: ""): initialization failed.
Sep 15 06:25:01 pecan pulseaudio[3559]: module-console-kit.c: GetUnixUser() call failed: org.freedesktop.DBus.Error.UnknownMethod: Method "GetUnixUser" with signature "" on interface "org.freedesktop.ConsoleKit.Session" doesn't exist

dpkg -l | grep -i pulseaudio
ii  gstreamer0.10-pulseaudio                   0.10.14-1ubuntu0.1                        GStreamer plugin for PulseAudio
ii  libpulse-browse0                           1:0.9.14-0ubuntu20.2                      PulseAudio client libraries (zeroconf support)
ii  libpulse-mainloop-glib0                    1:0.9.14-0ubuntu20.2                      PulseAudio client libraries (glib support)
ii  libpulse0                                  1:0.9.14-0ubuntu20.2                      PulseAudio client libraries
rc  libpulsecore5                              0.9.10-2ubuntu9.3                         PulseAudio sound server core
ii  libpulsecore9                              1:0.9.14-0ubuntu20.2                      PulseAudio sound server core
ii  libsdl1.2debian-pulseaudio                 1.2.13-4ubuntu3                           Simple DirectMedia Layer (with X11 and PulseAudio options)
ii  padevchooser                               0.9.3-2ubuntu4                            PulseAudio Device Chooser
ii  paman                                      0.9.4-1ubuntu2                            PulseAudio Manager
ii  paprefs                                    0.9.7-0ubuntu1                            PulseAudio Preferences
ii  pavucontrol                                0.9.7-1ubuntu3                            PulseAudio Volume Control
ii  pavumeter                                  0.9.3-1ubuntu1                            PulseAudio Volume Meter
ii  pulseaudio                                 1:0.9.14-0ubuntu20.2                      PulseAudio sound server
ii  pulseaudio-esound-compat                   1:0.9.14-0ubuntu20.2                      PulseAudio ESD compatibility layer
ii  pulseaudio-module-gconf                    1:0.9.14-0ubuntu20.2                      GConf module for PulseAudio sound server
ii  pulseaudio-module-hal                      1:0.9.14-0ubuntu20.2                      HAL device detection module for PulseAudio sound server
ii  pulseaudio-module-x11                      1:0.9.14-0ubuntu20.2                      X11 module for PulseAudio sound server
ii  pulseaudio-module-zeroconf                 1:0.9.14-0ubuntu20.2                      Zeroconf module for PulseAudio sound server
ii  pulseaudio-utils                           1:0.9.14-0ubuntu20.2                      Command line tools for the PulseAudio sound server

dpkg -l | grep -i libacr
<nothing install>

pulseaudio --version
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
I: caps.c: Dropping root privileges.
I: caps.c: Limited capabilities successfully to CAP_SYS_NICE.
pulseaudio 0.9.14