Currently can not reproduce the error.
Will update if I do.
Word Press 3.8.1
PHP Fatal error: Call to undefined function get_current_screen() in [snip]/wp-content/plugins/new-user-approve/includes/user-list.php on line 187
grep -R get_current_screen *
indicates
134: wp-admin/includes/screen.php:function get_current_screen() {
Yes I signed in.
new-user-approve Version: 1.5.7
