When I change a description using the AJAX inline editing all special characters (accented ones, etc) are converted into something unreadable. When editing is done using the "Edit entry" icon all special characters are properly maintained.
I think the problem can be solved in the file admin/js/ajax_editing.js but I have no clue with regards to JavaScript programming.
bueno , finalmente y despues de un acumulado de 20 hras solucione el problema, lo hice con un htmlentities en cada llamada y con un html_entity_decode para cada lectura