I have a few apps that are stuck on waiting status although they have already been open before. I can even open them via the task switcher, but not via the icon.
Apps stuck on "waiting" on springboard. I cannot open them
I had the same issue. What worked for me is to completely power off the phone. On restart I was able to delete the app and then reinstall it.
Took the same actions as you did. Had to reconfigure some of them which sucked. Here to hoping it won't happen again!http://en.wikipedia.org/wiki/%F0%9F%8D%BB
Same issue, I was able to tap on it a couple times and eventually it allowed me to delete and reinstall.
With all of the new App Store refinements that are going into the new update I imagine that is the source of the issue.