Could you try to open it in IE in the player local webserver please, then inspect it to see if it shows any errors ?
webserver port number by default is 9696
You can double check that in Display settings page -> Edit display profile assigned to this display -> Advanced tab -> Embedded Web Server Port
file name - is the .htm file name that corresponds with this layout in the player library it will be for example something like 854.htm
so then you’d navigate to
localhost:9696/854.htm to open it
Xibo player must be running for the local webserver to work and obviously you’d need to check it on the PC that runs the player.