Вы видимо загружали файлы с нелатинскими буквами в названии.
Как временное решение, открыть файл manager\media\browser\mcpuk\connectors\php\Commands\FileUpload.php
После 70 строчки if ($_FILES[’NewFile’][’size’]<($typeconfig[’MaxSize’]*1024)) {
$transliteration_table = array(' ' => '-','&' => 'and','\'' => '','A' => 'A','A' => 'A','A' => 'A','A' => 'A','A' => 'A','A' => 'A','A' => 'A','A' => 'A','A' => 'e','A' => 'A','A' => 'A','A' => 'A','?' => 'e','?' => 'E','A' => 'A','A' => 'A','A' => 'A','C' => 'C','C' => 'C','C' => 'C','C' => 'C','C' => 'C','C' => 'C','D' => 'D','D' => 'D','E' => 'E','E' => 'E','E' => 'E','E' => 'E','E' => 'E','E' => 'E','E' => 'E','E' => 'E','E' => 'E','E' => 'E','E' => 'E','E' => 'E','E' => 'E','G' => 'G','G' => 'G','G' => 'G','G' => 'G','H' => 'H','H' => 'H','I' => 'I','I' => 'I','I' => 'I','I' => 'I','I' => 'I','I' => 'I','I' => 'I','I' => 'I','I' => 'I','I' => 'I','I' => 'I','I' => 'I','I' => 'I','?' => 'J','J' => 'J','K' => 'K','L' => 'K','L' => 'K','L' => 'K','?' => 'K','N' => 'N','N' => 'N','N' => 'N','N' => 'N','N' => 'N','?' => 'N','O' => 'O','O' => 'O','O' => 'O','O' => 'O','O' => 'O','O' => 'O','O' => 'O','O' => 'O','O' => 'e','O' => 'e','O' => 'O','O' => 'O','O' => 'O','O' => 'O','O' => 'O','?' => 'E','R' => 'R','R' => 'R','R' => 'R','S' => 'S','S' => 'S','S' => 'S','?' => 'S','T' => 'T','T' => 'T','T' => 'T','?' => 'T','U' => 'U','U' => 'U','U' => 'U','U' => 'U','U' => 'U','U' => 'U','U' => 'e','U' => 'U','U' => 'e','U' => 'U','U' => 'U','U' => 'U','U' => 'U','U' => 'U','W' => 'W','Y' => 'Y','Y' => 'Y','Z' => 'Z','Z' => 'Z','a' => 'a','a' => 'a','a' => 'a','a' => 'a','a' => 'e','a' => 'e','a' => 'a','a' => 'a','a' => 'a','a' => 'a','a' => 'a','?' => 'e','c' => 'c','c' => 'c','c' => 'c','c' => 'c','c' => 'c','d' => 'd','d' => 'd','e' => 'e','e' => 'e','e' => 'e','e' => 'e','e' => 'e','e' => 'e','e' => 'e','e' => 'e','e' => 'e','?' => 'f','g' => 'g','g' => 'g','g' => 'g','g' => 'g','h' => 'h','h' => 'h','i' => 'i','i' => 'i','i' => 'i','i' => 'i','i' => 'i','i' => 'i','i' => 'i','i' => 'i','?' => 'i','?' => 'j','j' => 'j','k' => 'k','?' => 'k','l' => 'l','l' => 'l','l' => 'l','l' => 'l','?' => 'l','n' => 'n','n' => 'n','n' => 'n','n' => 'n','?' => 'n','?' => 'n','o' => 'o','o' => 'o','o' => 'o','o' => 'o','o' => 'e','o' => 'e','o' => 'o','o' => 'o','o' => 'o','o' => 'o','?' => 'e','r' => 'r','r' => 'r','r' => 'r','u' => 'u','u' => 'u','u' => 'u','u' => 'e','u' => 'u','u' => 'e','u' => 'u','u' => 'u','u' => 'u','u' => 'u','u' => 'u','w' => 'w','y' => 'y','y' => 'y','z' => 'z','z' => 'z','?' => 's','?' => 's','?' => 'A','?' => 'A','?' => 'B','?' => 'G','?' => 'D','?' => 'E','?' => 'E','?' => 'Z','?' => 'I','?' => 'I','?' => 'TH','?' => 'I','?' => 'I','?' => 'I','?' => 'K','?' => 'L','?' => 'M','?' => 'N','?' => 'KS','?' => 'O','?' => 'O','?' => 'P','?' => 'R','?' => 'S','?' => 'T','?' => 'Y','?' => 'Y','?' => 'Y','?' => 'F','?' => 'X','?' => 'PS','?' => 'O','?' => 'O','?' => 'a','?' => 'a','?' => 'b','?' => 'g','?' => 'd','?' => 'e','?' => 'e','?' => 'z','?' => 'i','?' => 'i','?' => 'th','?' => 'i','?' => 'i','?' => 'i','?' => 'i','?' => 'k','?' => 'l','?' => 'm','?' => 'n','?' => 'ks','?' => 'o','?' => 'o','?' => 'p','?' => 'r','?' => 's','?' => 't','?' => 'y','?' => 'y','?' => 'y','?' => 'y','?' => 'f','?' => 'x','?' => 'ps','?' => 'o','?' => 'o',
//russian chars
'а'=>'a', 'б'=>'b','в'=>'v', 'г'=>'g', 'д'=>'d', 'е'=>'e','ё'=>'e', 'ж'=>'j', 'з'=>'z', 'и'=>'i','й'=>'y', 'к'=>'k', 'л'=>'l', 'м'=>'m','н'=>'n', 'о'=>'o', 'п'=>'p', 'р'=>'r','с'=>'s', 'т'=>'t', 'у'=>'u', 'ф'=>'f','х'=>'h', 'ц'=>'ts' ,'ч'=>'ch', 'ш'=>'sh','щ'=>'sch', 'ъ'=>"'" ,'ы'=>'i', 'ь'=>"",'э'=>'е', 'ю'=>'yu', 'я'=>'ya', 'А'=>'A','Б'=>'B', 'В'=>'V', 'Г'=>'G', 'Д'=>'D','Е'=>'E', 'Ё'=>'E', 'Ж'=>'J', 'З'=>'Z','И'=>'I', 'Й'=>'Y', 'К'=>'K', 'Л'=>'L','М'=>'M', 'Н'=>'N', 'О'=>'O', 'П'=>'P','Р'=>'R', 'С'=>'S', 'Т'=>'T', 'У'=>'U','Ф'=>'F', 'Х'=>'H', 'Ц'=>'TS', 'Ч'=>'CH','Ш'=>'SH' ,'Щ'=>'SCH', 'Ъ'=>"'", 'Ы'=>'I','Ь'=>"", 'Э'=>'Е','Ю'=>'YU', 'Я'=>'YA');
$filename = strtr($filename, $transliteration_table);
Таким образом названия файлов будут переименованы в соответствии с таблицей.
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