Hi hamen,
Please try if this fixes it. Change lines 570-574 of file 'environment/functions/general.php' from:
//Replace full urls with hyperinks. Avoids " character for already rendered hyperlinks
$text = preg_replace('@([^"\']|^)(https?://([-\w\.]+)+(:\d+)?(/([\w/_\-\.]*(\?\S+)?)?)?)@', '$1<a href="$2" target="_blank">$2</a>', $text);
//Convert every word starting with "www." into a hyperlink
$text = preg_replace('@(>|\s|^)(www.([-\w\.]+)+(:\d+)?(/([\w/_\-\.]*(\?\S+)?)?)?)@', '$1<a href="http://$2" target="_blank">$2</a>', $text);
to:
//Replace full urls with hyperinks. Avoids " character for already rendered hyperlinks
$text = preg_replace('@([^"\']|^)(https?://([-\w\.]+)+(:\d+)?(/([\w/_\-\.\+]*(\?\S+)?)?)?)@', '$1<a href="$2" target="_blank">$2</a>', $text);
//Convert every word starting with "www." into a hyperlink
$text = preg_replace('@(>|\s|^)(www.([-\w\.]+)+(:\d+)?(/([\w/_\-\.\+]*(\?\S+)?)?)?)@', '$1<a href="http://$2" target="_blank">$2</a>', $text);