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[XXLRay <xxlray@xxxxxx>]

I think I worked around the issue. I re-imported
09102012012_stabilized.mp4 (which is the file where the project got
broke) and all thumbnails came back. I guess any other project file
would have done it, too. I right-clicked the depending thumbnail and
chose "Remove from project". The thumbnail and the clip on the track
disappeared and all other clips and tracks cam back. The saved project
file (attached) is now properly loadable (although I did not include
09102012012_stabilized.mp4 again yet).

Nevertheless I think it should be a major issue that a project file can
break.

** Attachment added: "Fixed project file"
   https://bugs.launchpad.net/openshot/+bug/1073844/+attachment/3423349/+files/Timeshift_Britain_2012.osp

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https://bugs.launchpad.net/bugs/1073844

Title:
  Thumbnails, clips and tracks gone (but preview is fine)

Status in OpenShot Video Editor:
  New

Bug description:
  I use openshot 1.4.3 from the bazaar repository on Ubuntu 11.10.

  I accidentally deleted a cut part of a clip on a track. Afterwards I
  pressed ctrl+z to undo this change. The clip was restored but at the
  same time all thumbnails from the project file window, all following
  clips on the same track and all tracks on the bottom of this clip's
  track were removed.

  I thought it was just a display glitch as the preview still worked
  just fine. Thus I saved the file (as I made many changes from the last
  save) and opened the project again. Unfortunately the following error
  message pops up:

  There was an error opening this project file.
  Please be sure you open the correct *.osp file.

   The command line shows the following text:

  /home/myusername/openshot/openshot/classes/sequences.py:781: GtkWarning: gdk_pixbuf_scale_simple: assertion `dest_width > 0' failed
    new_pixbuf = pixbuf.scale_simple(remaining_pixels, height, gtk.gdk.INTERP_NEAREST)
  Traceback (most recent call last):
    File "/home/myusername/openshot/openshot/windows/MainGTK.py", line 2508, in on_hsZoom_value_changed
      self.project.Render()
    File "/home/myusername/openshot/openshot/classes/project.py", line 221, in Render
      self.sequences[0].Render()
    File "/home/myusername/openshot/openshot/classes/sequences.py", line 171, in Render
      MyTrack.Render()
    File "/home/myusername/openshot/openshot/classes/track.py", line 94, in Render
      MyClip.Render()				
    File "/home/myusername/openshot/openshot/classes/clip.py", line 287, in Render
      self.RenderClip()
    File "/home/myusername/openshot/openshot/classes/clip.py", line 1163, in RenderClip
      pixbuf_width = pixbuf.get_width()
  AttributeError: 'NoneType' object has no attribute 'get_width'

  Thumbnails, clips and tracks are still missing as described above but
  the preview works fine (the project file has not been moved to another
  location). I conclude that the project information is still there but
  is not displayed. Unfortunately the project is not editable for me
  that way any more. Please help me to fix this as I already put several
  hours of work into this video project.

  The project file is attached. Please tell me if you need more
  information.

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