@joseph
Thanks! “set your blog domain as the callback url” fixed the problem for me.
My settings:
Access level: Read-only
Callback URL: http://www.my-blog-domain.de <– Your domain here
Sign in with Twitter: No <– “No” seems to be ok
WP 2.2.x treats the trailing slash in a different way than before (function user_trailingslashit). Blogs with a permalink structure with filename extension like .html cannot have a trailing slash in the permalink setup. Hence the trailing slash of archive links and category links are now missing.
To fix this, you are welcome to use my plugin Smart Trailing Slash.
Download: http://www.fastagent.de/res/download/smart-trailing-slash.zip
Just unzip, upload and enjoy!