Internal Server Error after Update

Hi there.
Afert updating to OMV 0.3.0.16 I have an Internal Server Error trying to access my OMV Web GUI.
All my smb/nfs shares are still working. I still have access via SSH.
I have restarted apache server --> No success.
Rebooting my systen --> No success.
My openmediavault-webgui_error.log contains this:
[Tue Jul 03 15:51:31 2012] [warn] [client 192.168.178.36] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
[Tue Jul 03 15:51:31 2012] [error] [client 192.168.178.36] Premature end of script headers: index.php

What happened to my system?

I have found a solution on my own.
Trying to update via apt-get I saw that virtualbox didn't update when that happened.
I killed all running process from user vbox.
removed virtualbox via apt-get.
After this I had access to OVM WebGUI.
I have installed virtualbox again.
Now everything works again as before. No VM got lost.
Lucky me. Don't have to reinstall OMV at least for this time.