HI Gaetan; It seems that severals people 've got this issue.
In my case, I replied to this topic Layout is not adjusted to the screen - #8 by DanBW
See you
Fred
" Hi , same issue randomly on windows players with classic hard drive no SSD (old intel NUC min pc 4Go RAM), I thought it was because of the charging latency of the xibo client (latest 2R257-2) on old device. Juste put on start up menu a ping command ping www.google.fr -n 10, to loose time ;-), this seems working since but …esoteric solution …
Hope will help"