Thanks Chad, I had a look again at the pdf
transfert it from the server to a windows ftp server open it again ,and it's still blank.
Anyway I will replace it with one from my machine and see if that replace it in the bbb client.
What about the logo in png format?
When I use it all the client can not see the icon microphone, video,... or language, layout,....
Does the logo needs to be in a specific format?