What did you do to cause this? Fresh installation
What page were you on? /users/1 and /admin/
What PHP and MariaDB versions do you run? PHP 7.1.1 and MariaDB 15.1
Describe the defect: PHP7 changed how variables-variables are processed (explanation here). Among other things, it makes the group view unloadable and breaks functionality such as admin panel.
I know that PHP 7 isn't officially supported in 3.X, but the fix is easy and won't break PHP 5.
File vendor/avalon/database/model.php line #401 changes from:
return $this->$var = $model::find($belongs_to['foreign_key'], $this->$belongs_to['column']);
To:
return $this->$var = $model::find($belongs_to['foreign_key'], $this->{$belongs_to['column']});
Thank you for the report, I have not tested on PHP 7 much. Will try to get this done ASAP after work. Thank you again.