App does not Work

The last version from the app usei to identify my receiver model RXV3900, it was working on both tablet and iPhone the app does not recognize my receiver anymore , ive tried to input the receiver ip and the app recognizes only his name soo now i am waiting to get a new version to corrente this.
Após a última atualização o app parou de funcionar. Não identifica o receiver mesmo ele estando recebendo as rádios e com o stand-by corretamente ajustado. ajustei o IP do aparelho e nada acontece. Socorro programadores de plantão.

Jeff-br2015 about AV CONTROLLER, v4.21