Software Center does not trigger update mechanism

[Joachim]

As usual in a daily build there are a lot of updates frequently. Whyle command line tools like
apt-get upgrade and apt upgrade as well as the full-upgrade option run perfectly the gui component of elementarys software center does nothing after entering the first users password after hitting the update button.

ProblemType: Bug
DistroRelease: elementary 0.4
Package: elementary-desktop 1.412+467~daily~ubuntu0.4.1 [origin: LP-PPA-elementary-os-daily]
ProcVersionSignature: hostname 4.4.0-24.43-generic 4.4.10
Uname: Linux 4.4.0-24-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CrashDB: elementary_meta
CurrentDesktop: Pantheon
Date: Wed Jun 15 04:10:01 2016
ProcEnviron:
 LANGUAGE=de_DE
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: elementary-meta
SuspiciousXErrors:

ThirdParty: True
UpgradeStatus: No upgrade log present (probably fresh install)