Datastorer not updating datastore for updated dropbox files?

[scottbw]

I have a resource loaded from Dropbox:

http://ckan.it.ox.ac.uk/dataset/d3js-testing/resource/e164bd03-029c-401b-8ade-fa2bd46277fc

If I update the CSV file in my dropbox folder, and run the datastorer job, I get this in the log, indicating (I think) that all is well:

2013-10-31 15:37:58,752 WARNI [root] Resource downloaded: id=e164bd03-029c-401b-8ade-fa2bd46277fc url=u'http://dl.dropboxusercontent.com/u/4504633/test.csv' cache_filename=/tmp/tmpV6Ot7g length=643845 hash=f8ae8346600f6266ec3b68c354096dea049e0081

(I've tried this a few times and the length and hash does keep varying whenever I edit the linked CSV file)

However, back in CKAN the recline preview still shows the old data, as does the CKAN Data API.