Photos: slideshow: turn looping OFF

Next please try the following:

1 - Create a new empty library and try with that library open (hold down the option key while starting photos, and click "create new". To switch back to your currently library afterwards, do the option key start again)

2 - Try booting in safe mode - does it still happen?

3 - Try creating a new user account and try when logged into that account.

These checks will tell us if the problem is system wide, or linked to a particular library or user account.

CJFrogman wrote:

#1 & 3: I am pretty sure that attempting these would scramble my entire system irrevocably.

#2: "Booting in the safe mode..." what is that?

#1 & #3: what do you think having a second library would scramble your system? A user can have multiple libraries as this shows:

Also having additional user accounts on a Mac is normal. There's nothing dangerous about either. A second, plain admin account is an excellent troubleshooting tool.

Often creating and opening a new library fixes some preference and/or cache files and lets the original library work as it should.

#2: This is what a Safe Mode boot does:

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches,

All are part of standard trouble shooting techniques.

I meant where is the Photos library stored. Normally called photos library.photoslibrary in the pictures folder.

You can check by opening photos preferences.

We are not magicians. We can't fix your system by divine intervention.

If you are not prepared to work with us and try some stuff, we can't help.

We're not?

It is working fine for me, but I've not yet upgraded to 11.4 (I'm on 11.3) What happens if you try a different theme?

I'll also ask the inevitable question: Where is your library stored? In your pictures folder, or somewhere else?