Comment 2 for bug 521907

dvdrip has been updated today to version 1:0.98.10-0.2ubuntu7 (that corrects https://bugs.launchpad.net/ubuntu/+source/dvdrip/+bug/527462)
With this version, the behavior is slightly different : when I click on "add to cluster", a window opens (the "cluster control panel"), but with a popup saying that dvdrip-master did not start correctly.

If I start dvdrip-master manually, it fails with the following error message :
$ dvdrip-master

The following Perl modules are needed for the cluster mode:

    Event

Please read the documentation at:

    http://www.exit1.org/dvdrip/doc/install.cipp#cluster
    http://www.exit1.org/dvdrip/doc/cluster.cipp

$ ls -al /usr/share/perl5/Event/
total 28
drwxr-xr-x 4 root root 4096 2010-03-02 07:40 .
drwxr-xr-x 56 root root 4096 2010-02-24 08:12 ..
drwxr-xr-x 5 root root 4096 2010-02-14 18:49 ExecFlow
-rw-r--r-- 1 root root 3798 2009-12-19 12:46 ExecFlow.pm
drwxr-xr-x 3 root root 4096 2010-03-02 07:40 RPC
-rw-r--r-- 1 root root 5260 2008-10-25 10:35 RPC.pm

It looks like the Event Perl module dependency has been added to dvdrip package, but is not found by dvdrip-master
I tried to reinstall packages libevent-rpc-perl and libevent-execflow-perl, but it did not change the behavior