utf-8 problem in update from rc3 to rc4

[https]

To whom it may concern ,
After update process, we encountered Encoding problem. All characters changed to Question marks .
What' the reason of rc4 to rc3 during updating? and Why data does not transfer to Database with Unicode?
Thanks in advance

[Illori]

check out http://www.simplemachines.org/community/index.php?topic=407762.0 there is a fix on page 2