Hi Marcio.
There's a lot that can go wrong when generating a thumbnail for a
particular image (missing dependencies, filesystem permission errors, IO
errors, etc), and Mezzanine will just return the original image if that
happens. I recommend you take a look at the code
<https://github.com/stephenmcd/mezzanine/blob/master/mezzanine/core/templatetags/mezzanine_tags.py#L269>
and all the exception handling that happens there and try to determine
which one applies to your case.
You should also try to search in the mailing list and the issue tracker,
because I remember other people experiencing similar trouble.
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