here is the call stack of the error that happens with the avatar upload:

This is happening in the Amazon S3 storage adapter during avatar creation. The AWS S3 library is trying to traverse to a parent directory (..) which open_basedir blocks.

You have various possibilities to solve this: 

1. Adjust open_basedir settings in PHP config: Add the parent directory or disable it. 
2. If you use cPanel/Plesk: there is usually a PHP settings option to modify open_basedir
3. You could change the storage location for avatars to "local" instead of S3
4. You could check if you can add a .htaccess option: php_admin_value open_basedir none / only works if server allows it

I switched storage location for photos and avatars to "local" to test and it works as expected.

Please adjust open_basedir settings.

good, will work. I close this ticket.