It's a BB Playbook, version 2.1.0.1526. There are some default system apps in the top section, such as the browser, video chat, calendar, App World etc...I was going to put those apps with the other apps in the bottom section of the home screen and they successfully switched over. When I tried putting them back, the apps just disappeared and I get an alert saying "array_insert invalid array index". I can't find those apps and I really need them.

Plz help!