Table editor fails to detect the default collation on some tables. Fetch it from SHOW TABLE STATUS instead as fallback. See http://www.heidisql.com/forum.php?t=6202

source/mysql_connection.pas

@@ -2428,6 +2428,8 @@ begin
   if Source is TDBObject then begin
     s := Source as TDBObject;
     Name := s.Name;
+    Collation := s.Collation;
+    Engine := s.Engine;
     Database := s.Database;
     NodeType := s.NodeType;
     Created := s.Created;