Using 4.4RC and this notice shows for every image under Settings in backend
Theme designer / Profile / Default images
User Gravatar Avatars is Disabled
and images do appear
Local test webserver

Notice: Undefined index: default-cover-male in
\administrator\components\com_community\views\themeprofile\tmpl\general.php on line 98

Notice: Undefined index: default-male-avatar in
\administrator\components\com_community\views\themeprofile\tmpl\general.php on line 107

Notice: Undefined index: default-cover-female in
\administrator\components\com_community\views\themeprofile\tmpl\general.php on line 135

Notice: Undefined index: default-female-avatar in
\administrator\components\com_community\views\themeprofile\tmpl\general.php on line 145

Notice: Undefined index: default-cover in
\administrator\components\com_community\views\themeprofile\tmpl\general.php on line 173

Notice: Undefined index: default-general-avatar in
\administrator\components\com_community\views\themeprofile\tmpl\general.php on line 186

Hi,

thank you for reporting, we will check this issue..

cheers!