apps won't close

When I hit the BB button and the apps running window pops up, in addition to phone, messages etc., it shows that the browser and application center are running. I click them, they open, and I do a menu close. The browser appears to close, but if I hold down the BB button again, it shows it still running. Same is true for application center. Why won't these close?

App center on Storm, PTT (ATT) both wont close

Home Screen, Messages, Browser, Phone App, and BB Messenger never close on all BBs

to get App Center to go away: load the program, hit the BB key to bring up the menu and disable "Auto Refresh List." The next time the phone starts up, App Center won't be left running