Philip Grant

And in fact, you can't change anything about the folder configuration when syncing is disabled - because the app pops up a modal dialog box with only two options: (1)...

Sounds like you are also experiencing this: https://github.com/amanharwara/altus/issues/275

Same for me on 5.0.2 on Windows 10. I fixed it by going back to 4.8.6, so it seems to be a change in Altus rather than in WhatsAppWeb itself.