I now have removed the mailwatch-plugin and since 2 weeks all is fine - no glitches anymore. Tests were done with version 1.1.0-5+b1 in Wheezy-amd64
I also reviewed my logs, recordings and local mail: There appears to be a correlation between "arriving of local mail" and the "lock-up of the desktop". I have configured a cron-job which "depending on result" sends a local mail to root which is aliased to my user account. The last 2 desktop lock-ups's exactly happened when such a mail was generated (and of course triggered the plugin). I don't know whether this information is also helpfull: when the lock-up's happened also a VM in VirtualBox was running and the NIC was in promiscuous mode for "bridged networking". Now all is fine and I have uninstalled the xfce4-mailwatch-plugin. I would appreciate if it is removed from the dependencies of the "xfce4-goodies", so it is not automatically installed. /Ingo -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org