>   File 
> "/mnt/ngswork/galaxy/galaxy-dist/lib/galaxy/visualization/data_providers/genome.py",
>  line 1170, in _get_dataset
>     return f, BigWigFile(file=f)
>   File "bigwig_file.pyx", line 127, in bx.bbi.bigwig_file.BigWigFile.__init__ 
> (lib/bx/bbi/bigwig_file.c:3011)
>   File "bbi_file.pyx", line 119, in bx.bbi.bbi_file.BBIFile.__init__ 
> (lib/bx/bbi/bbi_file.c:3508)
>   File "bbi_file.pyx", line 129, in bx.bbi.bbi_file.BBIFile.open 
> (lib/bx/bbi/bbi_file.c:3660)
>   File 
> "/mnt/ngswork/galaxy/galaxy-dist/eggs/bx_python-0.7.1_7b95ff194725-py2.6-linux-x86_64-ucs4.egg/bx/misc/binary_file.py",
>  line 30, in __init__
>     if struct.unpack( ">I", bytes )[0] == magic:
> error: unpack requires a string argument of length 4
> Is this a bug or have I done something unexpected?

This looks like an issue in visualizing a wiggle, bedgraph, or bigwig file. Can 
you provide a dataset to reproduce this issue?

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