indicator-applet does not show all applets reliably

beowulfk:~$ lsb_release -rd
Description: Ubuntu 13.10
Release: 13.10
beowulf:~$ apt-cache policy indicator-applet
indicator-applet:
  Installiert: (keine)
  Installationskandidat: 12.10.2+13.10.20130924.2-0ubuntu1
  Versionstabelle:
     12.10.2+13.10.20130924.2-0ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages

Upon fresh install of 13.10 the indicator-applet did not show the datestamp, but the applet for the user-settings and logoff. The System-Settings for showing the clock in the applet area were set to active, but the mask was greyed out - so the clock should have been shown.
After a restart, the clock is shown in the top right, but the applet for User-Settings-Logoff does not appear anymore.

This behaviour does not seem to be reproductive in a forcefull manner. But people are talking about random icons showing up or not on system startup. Here a link to a german thread about this: http://forum.ubuntuusers.de/topic/update-13-04-13-10-datum-und-uhrzeit-weg/#post-6087367

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: indicator-applet (not installed)
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Mon Nov 4 11:55:38 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-10-25 (9 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
SourcePackage: indicator-applet
UpgradeStatus: No upgrade log present (probably fresh install)