The problem was in the translation. In the green square you can appreciate the translation "Selecciona un amigo". Seems that vshare hidden php code find "Select Buddy" for case else.

In all translations, please sure to modify the next code in compose.tpl template file:

Before Translation:
Code:
<select name="buddy_name">
<option value="">Select Buddy</option>
{section name=i loop=$buddy_name}
{html_options values=$buddy_name[i].friends_name output=$buddy_name[i].friends_name selected=$receiver_name}
{/section}
</select>
After Translation:
Code:
<select name="buddy_name">
<option value="Select Buddy">Selecciona un amigo</option>
{section name=i loop=$buddy_name}
{html_options values=$buddy_name[i].friends_name output=$buddy_name[i].friends_name selected=$receiver_name}
{/section}
</select>