Am attempting to use the Tumblr Importer. Followed the directions and used the exact URL given to me by the plugin and the Tumblr application registration page returns "Urls that redirect are not allowed for default callback urls." Tried this a couple of different times last night and this morning and the same thing happens every time.
As far as I know I am not using any redirects. The blog is at http://marklindner.info/common/