Problems with charset em some application screens

Hi all,

i have some problems with special chars in some screens of my application, in some places, the characters ú, ç, ã are displayed as �, i dont put any explicit declaration of charset in application, in the index.html have in the head tag a value:

<meta charset="utf-8">

in the config.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

what may cause this problem?