The way I got around this problem was to cd to the cron directory and either run gump.sh in that directory or python gump.py. There is another copy of gump.py in the cron directory which works differently to the one in the root directory. I think this is the one used in the official runs.
That seems to do it, thanks.
Oddly, the "getting started" page gives instructions on installing and configuring Gump, but stops just short of actually *running* it. :)
-- Sometimes the Universe needs a change of perspective. --J. Michael Straczynski
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