I've encountered a strange problem, and probably a very rare one, as I have searched but could not find any topics similar to mine.
My Contacts and App World won't open. When I click the icon to open the apps, nothing happens. I thought it was because of my Skype and Kakao app, so I deleted those. Still nothing. So I deleted the App World and reinstalled it. Still nothing.
After many reboots and battery pulls, I'm not sure what else to do. I had this problem a few months ago, and had to just wipe the phone and start fresh. I'm hoping I don't have to do that again, as it took FOREVER to make my customizations.
Seems to me like you'll have to wipe, sorry. The only constellation I can give from my knowledge is perform a backup with BB desktop Manager. Then restore from that. Also try BB protect for just info. But I see no rememdy for it nor have I suffered from it.