There are problems with non-english characters in Stored Procedures. Various errors occur when SP name, parameter(s), and (internal) variables contains such non-english character(s)

For instance this SQL (with Danish characters)

DELIMITER //;
DROP PROCEDURE IF EXISTS ´test´.´æøå´//
CREATE PROCEDURE ´test´.´æøå´ ()
BEGIN
set @test = 'thisisatest';
END//
DELIMITER ;//

creates the SP ´æøå´ (and it shows up in SQLyog Object Browser), but this SQL

call ´test´.´æøå´();

returns

Error Code : 1305
PROCEDURE test.æøå does not exist
(10 ms taken)

The issue is fixed with MySQL 5.0.15 (first non-beta/rc release)