I discovered a problem with the length of the ClassName or ID. If I use 'VistaPantallaCompletaID' it fails but change it for 'VistaCompletaID' and all its right.
Yahoo! => Is there a limitation on the length of a ViewID?
To my knowledge, no. I used to have view IDs which were "snippet-" + md5(input_value) in a widget I wrote and it did not have that issue. I'm guessing the problem was something else unrelated and you happened to fix multiple issues at the same time.