non-english character problem when save

hi
in sometimes when i want to save non english(in this case i use persian) character in the CB profile from the back-end , the character change to ???? and save in database.
look at the picture:

this problem only occur for additional field that i added that.(and it's label is persian too)
are you need additional information?
this problem some time occur not at all time, sime time when i edit some data of that's field.i was can't find logical for this problem time's.

Your database collation is either wrong on the table or on the column. Needs to be set to utf8. Search forums or Google for a number of solutions, but the short of it is you need to use phpmyadmin and fix your database collation.

hi again kerileon and excuse me for up the old topic but in 4 month ago i set the collection such as you can see in the attached picture
in the 1 , 2 , 3 not have any problem but in the 4, 5 i have ???? problem.
The common point of all the problem fields is that they are dumped through back-end management.
some times(only some time) when i edit some user through back-end, this problem is occur...
how can i solve that?

The storage behavior isn't going to sometimes break. That's just not how it works. None of the collations in your screenshots will have issues with storing valid UTF8 characters. I'm guessing you've something altering their values (e.g. maybe in CB Auto Actions) before or after storage. I'm guessing those are a text or textarea field and have retested both with UTF8 characters as working fine.