Issues between CMS and first client

hmm, one question are CMS library and Client library pointing to separate paths? (they need to)
It seems that you ‘default layout’ is blank, which is interesting, there should be something there - you might want to check that (and set some layout as default)
Did you schedule some other layouts? - for now I’d delete the scheduled events and just focus on default layout.

Perhaps have a look here too Why won't my layout play? / The splash screen plays instead of my layout

You might want to also go to Report Fault page, check if there are any (X) there, also enable debugging on that page.
Also the auditing on Displays page for your display.
Then check what’s on the ‘Logs’ page in CMS