I just encountered an enblend error. At the end of a Hugin run, I get
this message:

-------(1)-------
enblend: an exception occured
Mask is entirely black, but white image was not identified as
redundant.
make: *** [blend.tif] Error 1
-------(1)-------

After that, the process is interrupted. All intermediate TIFFs are
generated, but not the final, enblended, one.
A little back in the log, I read this:

-------(2)-------
[...]
Loading next image: blend0019.tif
Loading next image: blend0020.tif
Loading next image: blend0021.tif
Creating blend mask: 1/4 2/4 3/4 4/4
Optimizing 1 distinct seam.

Strategy 1, s0: 1/4enblend: some images are redundant and will not be
blended.
enblend: some images are redundant and will not be blended.
 2/4 3/4 4/4
Strategy 2: s0
Using 7 blending levels
[...]
-------(2)-------

>From the preview it is clear that some images are completely
overlapped by other images and probably won't be shown in the final
output. However this shouldn't prevent enblend from finalizing the
image, I'd presume.

It seems the issue has been encountered earlier by Michael Galloway.
Guio Kohlmeyer's solution was to pass the option '--fine-mask' to
enblend. I find that a strange solution slash workaround, which did
the trick by the way. But I still consider this an error.

One thing I noticed was that message (2) is still spawned, but in a
different form. Instead of the enblend message coming after 'Strategy
1, s0: 1/4', it now appears just before it. Could the error be in this
part? It looks like this:

-------(3)-------
[...]
Optimizing 1 distinct seam.
enblend: some images are redundant and will not be blended.
enblend: some images are redundant and will not be blended.
Strategy 1, s0: 1/4 2/4 3/4 4/4
Strategy 2: s0
Using 7 blending levels
[...]
-------(2)-------

(see 
http://groups.google.com/group/hugin-ptx/browse_thread/thread/c42857dceb7b6fe4/3297012a01321a1d
for the other thread)
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