When a URL (in a comment) contain Hungarian (maybe the problem also exists with other Central-European letters) accentuated letter ("á", "é", "í", "ó", "ö", "ő", "ú", "ü", "ű", "Á", "É", "Í", "Ó", "Ö", "Ő", "Ú", "Ü", "Ű") the automatic url parsing and the [url] BBCode can't parse the whole URL.