Gregory, did you try this ?
Black Screen When you try to open Application for First Time
--- start copy/paste from Gabriel_Kir ---
The problem is not random
in order to replicate the issue do the following.
restart the phone (the problem dissapear)
from Locked Screen
Press the home button in order to do a voice call. or use what ever u use to do voice calls (car kit, hand free etc)
do a call that the other will answer.
close the call as you usually do.
Try to open an application that it wasn't previously opened e.g. Calendar. you get the black screen
You get the black screen on first startup of any application
*** If you go to home and reopen the application then it will appear ok because it was already opened and was in the background.
** if you kill/close the application and try to reopen it, you will get again the black screen.
* This also happens to the camera shortcut on locked screen
***** In order to temporary fix the issue, restart the phone and everything will be ok until u do a voice call.
I hope that this post will help Apple devs to create a fix for the issue.
--- end copy/paste from Gabriel_Kir ---