vboxwebsrc seg fault after upgrading to Ubuntu 13.10

Hi all!

After upgrading my ubuntu host yesterday, I am no longer able to log into my phpvirtualbox as it says, that it can not connect to the host. After searching the web, I found out, that there is a problem with the vboxwebsrv and it was no longer running on my host. So I tried to start the service from the commandline.
When I open a commandline and start the vboxwebsrv service manually, I get this error:
sumpi@foo:~$ vboxwebsrv -H 127.0.0.1
Oracle VM VirtualBox web service Version 4.2.16_Ubuntu
(C) 2007-2013 Oracle Corporation
All rights reserved.
VirtualBox web service 4.2.16_Ubuntu r86992 linux.amd64 (Sep 21 2013 11:46:57) release log
00:00:00.017616 main Log opened 2014-02-09T07:11:12.179733000Z
00:00:00.017626 main OS Product: Linux
00:00:00.017628 main OS Release: 3.11.0-15-generic
00:00:00.017630 main OS Version: #25-Ubuntu SMP Thu Jan 30 17:22:01 UTC 2014
00:00:00.017674 main DMI Product Name: 965QM-DS2
00:00:00.017692 main DMI Product Version:
00:00:00.017799 main Host RAM: 1984MB total, 641MB available
00:00:00.017807 main Executable: /usr/lib/virtualbox/vboxwebsrv
00:00:00.017808 main Process ID: 6608
00:00:00.017810 main Package type: LINUX_64BITS_GENERIC (OSE)
00:00:00.197387 SQPmp #### SOAP FAULT: [SOAP-ENV:Server]
Speicherzugriffsfehler (Speicherabzug geschrieben)
Which means, a segfault occured.

So where should I go from here? Do I need to reinstall something, which was broken during upgrade?

Thanks in advance for any help!

BR,
Sumpi