Arkane Theme Fixing
1. Go to wp-content/theme/arkane
2. Open file function.php
3. Find this code and REMOVE it
define('BP_DEFAULT_COMPONENT', 'profile' );
4. Find these codes on line 243 and REMOVE it
5. File this code on line 637 and REMOVE it
Once you update your theme into newest version, all issues will happen again. so do same steps like tutorial above and it will be fixed again.