Are you using MODx 0.9.6.3?
How are the cyrillic characters showing up in the database (with phpmyadmin for example)?
Did you try using ’SET NAMES’ on your database connection to force it to be UTF-8?
As you are using MODx 0.9.6.3 this is quite definitely database issue.
What does the system info say about database (from MODx manager: Reports > System Info)?
Look for "Database Charset" and "Database Collation Charset". Are they both utf-8?
I also have a problem with character encoding, in TinyMCE, but only in the Link list.
I use MODx 0.9.6.3, and TinyMCE 3.2.4.1. (Same problem with all 3.x.x.x versions)
System Info states:
Database Charset utf8
Database Collation Charset utf8_general_ci
And yet, I cannot have swedish characters in Link list. Why?
This problem has been around for quite som time now, and there was a solution for 0.9.6.2, but I can´t find it, and seems like 0.9.6.3 is programmed differently.
Cheers
Amrit