Hello Graham,
If the other computers you tried using are inside your corporate or
group firewall, then you might have been able to access the file, but
people outside the firewall would fail.
You might check with your admins to see if this is the issue, and in
the meantime if you'd like to provide the real URL confidentially
off-list (you could email me directly) we could pursue further
investigation from our side.
Best regards,
Pauline Fujita
UCSC Genome Bioinformatics Group
http://genome.ucsc.edu
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