I’m having the same issue and it keeps pointing to a pluggable.php file. I keep turning each plugin off one at a time and cannot locate which one seems to be causing the issue since I upgraded.
That did the trick. Very strange. Thanks.
Here is the link I am trying to add:
http://20six.fr/lapinblanc
Name: Lap in Blanc
Firefox 2.0.0.4. No errors in logs that point to an issue. Using an http:// in the address. Using 2.2. I added links yesterday no problem and today this is happening.