Comment 5 for bug 899793

Moved this to nautilus as the problem is due to how emblems, and plaint text previews, are rendered. As noted in comment #4, the issue is with any emblem on a file with live text preview. This isn't an issue with PDF files, as they are rendered to thumbnail images, which then simply have the emblem composited on top. Possible solutions are to:

1) Render thumbnail PNGs of text files, instead of rendering live previews (which are basically useless anyway).
2) Disable live text preview (as it's basically useless if you aren't using extremely large icon sizes).
3) Fix nautilus to render live preview on top of composited icon with emblems (which may work already and simply require changes in the icon theme, which may look quite bad when live preview isn't used).

I would vote for number 2 myself. If Mark thinks the emblems used are just not good images, then a separate bug should be opened against the icon theme (humanity-icon-theme) for that specific issue, as Ubuntu One itself does not install any emblem images.