Blobstore Images Disappearing on Google App Engine Development Server

I'm using App Engine's high performance image serving on my site, and I'm able to get everything working properly on both my local machine and in production i.e. I can upload an image and successfully display the images using get_serving_url on the blob key. However, these images don't seem to persist on my development server, i.e. after I come back from a c开发者_如何学Pythonomputer restart, the images no longer show up. The development server spits out:

images_service_pb.ImagesServiceError.BAD_IMAGE_DATA

which I'm guessing is actually because the underlying blobs are no longer there (although this is just a hunch). The rest of my datastore is still intact though, as I'm using the launch setting "--datastore_path" to ensure my data persists. Is there a separate flag I need to be using to persist the blobs as well? Or is there a separate problem here that I'm missing?

You must use --blobstore_path=DIR:

--blobstore_path=DIR       Path to directory to use for storing Blobstore
                           file stub data.

You can see all options typing dev_appserver.py --help in the command line.