Hi,
I think the Variable is missing in your template. So, please change the "showthread" Template in your theme.
Search for
<strong>{$thread['displayprefix']}{$thread['subject']}</strong>
and change to
{$threadsolved}<strong>{$thread['displayprefix']}{$thread['subject']}</strong>
I think the Variable is missing in your template. So, please change the "showthread" Template in your theme.
Search for
<strong>{$thread['displayprefix']}{$thread['subject']}</strong>
and change to
{$threadsolved}<strong>{$thread['displayprefix']}{$thread['subject']}</strong>