They do not do the letter C, C, S, Z, DJ ...

[Doug McCartney]

instead of the above letter we show only question marks:?

Does anyone have a solution? and let it be well understood, because I'm not an expert on a forum

[Bob Perry of Web Presence Consulting]

Look in your Languages admin settings and tell me what is your default language selected?

[Arantor]

(more relevantly would be whether it's UTF-8 or not and whether the database is UTF-8 or not)

[margarett]

C, Z, etc, shouldn't cause issues with UTF/non-UTF...

[Branko.]

He wrote wrong... 
This is a common problem with serbian latinic and croatian letters Č,Ć,Š,Ž,Đ , database should be in utf8 (utf8_general_ci)

Arantor, great observation 

[Doug McCartney]

What interests me, where do I set UTF-8?

[Chas Large]

What interests me, where do I set UTF-8?

Admin > Configuration > Maintenance > Database.

READ THE WARNING !

You'll then need to install the relevant UTF-8 language pack.

[Doug McCartney]

Excellent! Thank you!

[Doug McCartney]

He wrote wrong... 
This is a common problem with serbian latinic and croatian letters Č,Ć,Š,Ž,Đ , database should be in utf8 (utf8_general_ci)

Arantor, great observation 

Now, when I put this all posts that are copied from somewhere disappeared .. is the name of the poster and all, but the field is empty ... Can I go back to these posts at all, even if the cost to me again, do not do T c S and @?

[Chas Large]

As an Admin, you can edit any / all posts and change usernames and display names if required.

[Doug McCartney]

Thank you!

[Doug McCartney]

utf8_general_ci on each other than on an old table from Ajax chat (no longer used)

[Doug McCartney]

Menu is working on 2.0.6 (Here in this topic solved) after upgrade all 3 beautiful!