Hello SleePy,
let you know arabic language not working fine with UTF-8
my SMF 2.0.11 database working on latin1_swedish_ci ,and arabic language working fine with this.
and for try i was convert simpledesk database from utf8_bin to latin1_swedish_ci ,but the problem not solved

i think the problem in simpledesk template
Ok,let me ask you ,in any file simpledesk template we can add this code ?
<meta http-equiv="Content-Type" content="text/html; charset=windows-1256" />
OR
header("Content-type: text/html; charset=windows-1256");
OR
<meta http-equiv='Content-Type' content='text/html; charset=windows-1256'>
OR
<meta http-equiv="Content-Type" content="text/html; charset=windows-1256">