Same problem. Uploaded WP 2.3.1 and as it was also the case with 2.2.2 again no any incoming links at all, as well as other things missing. The Dashboard refuses to execute the commands. It has nothing to do with technorati. With the latest versions of WP, the old file index.php under wp-admin is now split into two files: index.php and index-extra.php. It seems that for some users this is not a problem and they get incoming links (google or others). We uploaded the plugin to restore technorati, all seems well but no any incoming links. But looking at the program lines all seems to be OK but it simply does not work on our server.
Maybe there is a relation with the type of server or other criteria (windows based or unix based?). For us this is anyway a bug in the WP software. Not been able to understand why it does not work.
On another blog, based on another server and running WP 2.0.3 all is fine – incoming links, technorati etc.
We dowloaded for a short time the index.php file version 2.0.3 on the other server and technorati came out… Of course we had to restore it back because of other problems.
Now up to the brains to sort this out.