Only Default Layout works

We use Xibo in our school to display important messages to students.
After summerbreak the clients that we use in our hallway only display the default layout.
It doesn’t matter what kind of layout I try to schedule it never gets to the displays.
If I change the default layout the displays use this latest version.
Other clients in our school work properly.
Any idea how to fix this?

What CMS and player versions are you using please?

I’d suggest checking the date&time on the devices, if the default layout works after you change it, that implies player has connection to the CMS and can download from it, as such my guess is that date&time can be wrong, which causes scheduling issues.

My CMS and Client versions are 1.7.5 and time/date settings are correct!

The displays in question show this status in the recent logs:

Layout Change to failed. Exception raised was: Default layout