He actualizado de 3.7 a 3.9.1.
Pero cuando hago click en el link para añadir actividad o recursos, se abre la ventana popup, pero se queda pensando y nunca muestra los recursos para insertar.
He visto algunos post en ingles donde explican una manera de resolverlo; pero no termino de entender el procedimiento.
"After long reading, testing it seems now everything works. In our case we had a problem with guest user. We disabled Activity chooser and got error about used id=1 in debug mode. I checked database and guest users was missing. So we have enabled guest access and created guest users again, the id was 4xxxx, so using phpmyadmin I have changed that user id from 4xxxx to id 1, disabled guest access, enabled activity chooser and it started working."
----
"I have a setting in my Database of "the guestuser, deleted=1".
I changed it to "the guestuser, deleted=0" and now everything is good again."
Por favor, si alguien leyendo esto entiende que es lo que hay que hacer, le agradecería muchisimo.