Hi, i am trying to add some items in my component with Greek characters (we live in beautiful Greece !) and i get the character "?" in place of Greek text, after saving.

Joomla Version : 3.1.1
Iin sandbox shows corectly but not in live environment...
Cook VersionCook : 2.5
JS : JQuery
Form Style : Condensed
Features : Reduced
DB Automation : Table
Timeout : 30 secs

Project : Cinema Program
Table : Movies
Layout : Backend / Movies
Fields : Any String or Text field

Is it a caracter in aliases ?

Special chars are not allowed in the code.
It is only possible in the language file (Titles, ...)
I suggest you to write your component in english, and then translate it in Greek.
I saw your component and Greek caracters are working.