Recently I have been having an issue when I download certain apps. It will download with no problem, but as soon as it switches into the install phase I get an "installation unsuccessful", then if I click on that it reads "Installation error Unknown reason - 18" I called verizon, ended up doing a factory reset on my phone and then the dude gave up and sent me a replacement phone. So I went through all that and this is still happening. I dont believe it to be app specific because the verizon guy was able to install it, plus in the comments other people with a droid X had no issues. Any ideas??