download of app is frozen but cannot cancel

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http://androidforums.com – LG Optimus Showtime I just got this phone. Had several app downloads going and it got stuck on TubeMate. But there is no way to cancel the download to move along! No options through "Task Manager" to do anything with downloads. There is a "Downloads" app that is totally empty, so clearly it has nothing to actually do with downloads either, since there should be a queue. I click on the frozen download in that pull down screen and all it does it take me to Google Play, where I am informed that it cannot be found. I have tried turning the phone off, taking the battery out.. (General)