IMO, task killers are a pain to Android. It was designed to handle app management without human intervention. If you must meddle with this, just stop what you've started, if the app itself hasn't got any function to kill itself (not many do).
Works perfectly for me. I tap the ES Task Manager Widget that I placed on my HOME screen and it kills all processes that are not needed. I do that practically every time I go back to the HOME screen and have zero problems. Are you using the default ROM?
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