Hi Anders,
Can you try this:
1. Go here: WordPress Admin Area > Plugins
2. Deactivate the Datafeedr plugin
3. Delete the Datafeedr plugin
4. Download a new version of the plugin here:
http://www.datafeedr.com/download/
5. Install the new plugin here: WordPress Admin Area > Plugins > Add New > Upload
6. Activate the plugin
7. Go here WordPress Admin Area > Tools > Datafeedr
8. Click the [Update Products and Settings] button.
I think that should fix the problem.
Eric