By Karolos Grohmann RIO DE JANEIRO, Aug 16 (Reuters) - With the Rio de Janeiro Olympics in imminent danger of cementing a reputation as the most trouble-plagued Games in recent history, organisers are struggling to convince the world of their good intentions as problems increase by the day. Games chief spokesman Mario Andrada, an experienced journalist, has had the unenviable job of delivering bad news to a global media audience on a daily basis with organisers unable to make problems go away. A fire at the mountain bike venue that damaged signage among other things on Monday was the latest issue to hit the Olympics, already grappling with poor attendances, a lack of cash, chaotic transportation, a worrying shortage of volunteers, crime and a widespread feeling of malaise sweeping across the Olympic parks. More...