vBulletin 4.2.2 Error when Edit.

[Berenjeno]

Hi
I have some problem in my vbulletin 4.2.2 using this letter ñ,ó,í,.
this is the error: if the post has this letter ñ,ó,í when I try to edit the post its disappear all the information on the post.
Please if some one know how to correct the problem and is any guide please let me know.
thanks

[Berenjeno]

any Mod can close the thread y just correct the problem, thanks