[Answered ]-'bool' object has no attribute 'has_header' when uploading via a FileField in my admin

Found this somewhere else on the net, the problem is in the HideSensitiveFieldsMiddleware and the way to work around it (for debug) is to just comment out that middleware like so

    "pinax.middleware.security.HideSensistiveFieldsMiddleware",
+#    "pinax.middleware.security.HideSensistiveFieldsMiddleware",

in your settings file, probably should leave that middleware in for non debug environments