I encountered the same bug after importing a video stabilized with this

transcode -J stabilize -i art-01.mp4 -y null,null -o dummy
transcode -J transform -i art-01.mp4 -y xvid -o art-01-stable.mp4

Removing the clip didn't bring back my tracks but the preview is fine.

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

Status in OpenShot Video Editor:

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, 
  Traceback (most recent call last):
    File "/home/myusername/openshot/openshot/windows/MainGTK.py", line 2508, in 
    File "/home/myusername/openshot/openshot/classes/project.py", line 221, in 
    File "/home/myusername/openshot/openshot/classes/sequences.py", line 171, 
in Render
    File "/home/myusername/openshot/openshot/classes/track.py", line 94, in 
    File "/home/myusername/openshot/openshot/classes/clip.py", line 287, in 
    File "/home/myusername/openshot/openshot/classes/clip.py", line 1163, in 
      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

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