b8 0.5.2 out now
I just uploaded a new bugfix release for b8. The destructor of the MySQL storage backend always disconnected the MySQL connection, even if an existing link-resource was passed to b8. Release 0.5.2 fixes this. Now, the MySQL connection is only disconnected if b8 created the resource itself. Thanks to Gerhard Waldemair for the bug report!
Everyone can safely update to the new version. It's not necessary if you didn't have any problems with the MySQL backend or use the Berkeley DB backend. Only b8/storage/storage_mysql.php has been changed.