Have you ruled out plugin and theme conflicts?
Not theme related same behavior with TwentySeventeen.
The site has PaidMembershipsPro plugin with lots of add-ons needed for the functionality
It’s not a known bug so you will need to rule out the plugins in some way
I deleted all profile fields, set new profile fields in 2 groups: Base (Primary) and Company.
Now Company field group is not showing in the Profile page, and Base fields generate the same error when save changes is clicked.
Plugin disabled: BP Profile Shortcodes Extra (generated many errors including fatal error)
Plugin active: BuddyPress Xprofile Custom Field Types
Is there proven tutorial how to successfully add more fields in BP Profile?
When you had the profile shortcodes plugin activated, you got the fatal error that an undefined function was being called – bp_get_messages_slug, however this function does exist in any BuddyPress install that has messages enabled, so that error is pointing to a problem with your config – either something is stopping BP from loading correctly or messaging is not enabled. This pretty much points to other issues on your system which are messing with BP. Sometimes plugins throwing errors can provide useful insights into issues elsewhere in your install.
You might like to consider setting up a separate test system in order to better test your configurtion without messing with your live setup. It’s highly recommended for any critical WP install.
