1) Are you allowing special characters in user names?
2) Did you just recently switch your database tables from ISO-8859-1 to UTF-8?


iconv has to do with multibyte characters. Does your new server have the iconv() library installed
https://www.hackersgarage.com/iconv-php-extension-installation-without-recompiling-php.html
Attachments
20170116_11-35-17.PNG


Current developer of UBB.threads PHP Forum Software
Current Release: UBBT 7.7.5 // Preview: UBBT 8.0.0
isaac @ id242.com // my forum @ CelicaHobby.com