Hi. I get exactly the same problem except I get the number “51” and that’s all. It happened without making any changes to the config or files.
It happens here on this page;
/wp-admin/edit-comments.php?page=akismet-admin
Since then I have deactivated and reactivated the plugin
Deleted the the akismet files and uploaded them again.
Upgraded to Akismet 2.2.2
Upgraded WordPress to 2.6.5
All of which have made no improvement to the problem.
Any help most gratefully received.