Bug#563900: pitivi: Doesn't start (ImportError: No module named instance)

[Jan Prunk]

Package: pitivi
Version: 0.93-4.2
Followup-For: Bug #563900

Dear Maintainer,

These is the system information of the tested machine.

-- System Information:
Debian Release: 8.7
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages pitivi depends on:
ii  gir1.2-clutter-1.0                                  1.20.0-1
ii  gir1.2-clutter-gst-2.0                              2.0.12-1
ii  gir1.2-gdkpixbuf-2.0                                2.31.1-2+deb8u5
ii  gir1.2-ges-1.0                                      1.2.1-1
ii  gir1.2-glib-2.0                                     1.42.0-2.2
ii  gir1.2-gst-plugins-base-1.0                         1.4.4-2
ii  gir1.2-gstreamer-1.0                                1.4.4-2
ii  gir1.2-gtk-3.0                                      3.14.5-1+deb8u1
ii  gir1.2-gtkclutter-1.0                               1.6.0-1
ii  gir1.2-pango-1.0                                    1.36.8-3
ii  gnome-icon-theme                                    3.12.0-1
ii  gstreamer1.0-gnonlin                                1.2.1-1
ii  gstreamer1.0-plugins-bad [gstreamer1.0-videosink]   1.4.4-2.1+deb8u1
ii  gstreamer1.0-plugins-base                           1.4.4-2
ii  gstreamer1.0-plugins-good [gstreamer1.0-videosink]  1.4.4-2+deb8u2
pn  gstreamer1.0-pulseaudio | gstreamer1.0-audiosink    <none>
ii  gstreamer1.0-x [gstreamer1.0-videosink]             1.4.4-2
ii  libc6                                               2.19-18+deb8u7
ii  libcairo2                                           1.14.0-2.1+deb8u2
ii  python                                              2.7.9-1
ii  python-cairo                                        1.8.8-1+b2
ii  python-dbus                                         1.2.0-2+b3
ii  python-gi                                           3.14.0-1
ii  python-gi-cairo                                     3.14.0-1
ii  python-gst-1.0                                      1.2.1-1.1
ii  python-matplotlib                                   1.4.2-3.1
ii  python-numpy                                        1:1.8.2-2
ii  python-xdg                                          0.25-4

pitivi recommends no packages.

Versions of packages pitivi suggests:
ii  frei0r-plugins             1.4-3
pn  gir1.2-gnomedesktop-3.0    <none>
ii  gir1.2-notify-0.7          0.7.6-2
ii  gstreamer1.0-libav         1.4.4-2
ii  gstreamer1.0-plugins-ugly  1.4.4-2+b1

-- no debconf information

Kind regards, 
Jan Prunk