I recently purchased a Droid Charge. It's been working great until recently. Anytime I try to download ANY app from the market, it proceeds to download, then fails. A message pops up that says "Package File Invalid". I have no idea what this means. To further the situation, when apps I already have need to update. The same thing happens. The begin to download, then the message pops up again. I've deleted apps, cleared cache. I don't know what else to do. Can anyone help?