I created a csv Feed that would create new content. I uploaded the csv file and started an import job. Unfortunately, the csv file had some headers that did not quite match those defined in the Feed. Actually, when I try to import, nothing happens, I get this bar and then nothing. No error messages, etc. What would hold up the import process? There does not seem to be a way to actually abort the job. When I try to update the file, drupal says it is being used in an application (which I assume is the incomplete feed import job). How can we stop the import job so we can fix the file, update it and re-run the import?