I am unable to install any app from Amazon's Appstore. It seems that everything I try to install (and this includes both things that I already had in Amazon's "cloud" and things I newly chose) downloads successfully but then it gets stalled in the "Installing..." phase (that is, on the "Cloud" screen that lists all the apps I've downloaded or purchased; if I tap on the specific app, it brings up a detail screen that shows "Install pending..."). I've tried clearing Appstore's data and even uninstalling and reinstalling it (I think I've done that three times now). If I don't at least clear the data, the app to be installed still shows up as "Installing..." each time I open Appstore. I'm running the stock, unrooted ZTE 4.1.1 ROM. Does anyone have any advice for me to get Appstore to work?