Unable to download/update apps, lost App World from BB9780 and unable to download App World again

Hi, I see posts about this subject but none have helped me so far. I seem to have accumulated 3 issues
Since a couple of weeks I am unable to download apps from the app world or update apps from the app world.
1. unable to download / update apps from App World
The progress bar of the download progresses some and the it hoves me the error "There was a problem during installation, please try again".
2. While trying to fix this issue 1, the App World icon has disappeared from my BB9780. On the desktop software I see that the App World stll shows as installed on my device (version 3.1.1.121). a search on my device shows nothing though.
3. I try to fix the issue 2 by reinstalling the App World. Everything goes well untill the language selection. Final message is whether I want to replace version 3.1.1.121 with version 3.1.1.121? When continuing I receive the error "Download failed". Detailed error mesage: "909 Application authentication failure".
Please help me how to fix this. I have tried:
-battery pulls
-security wipes
-time zone synch
nothing seems to help.
Thanks in advance. Rob

Hi, jimac.1729.  
Thank you for visiting Apple Support Communities.  
I understand that you are unable to download or update an App.  Sometimes simply forcing all apps to close and restarting the device can resolve this issue.  Also, try going through the steps outlined below.   
Force an app to close in iOS
Troubleshoot issues on an iPhone, iPad, or iPod touch
If you haven't been able to connect to the iTunes Store:
Make sure your date, time, and time zone are correct in Settings > General > Date & Time.
Note: Time Zone may list another city in your time zone.
Make sure that your iOS software is up to date by tapping Settings > General > Software Update(iOS 5 or later) or connecting your iOS device to iTunes and clicking Check for Update on your device's Summary page.
Check and verify that you're in range of a Wi-Fi router or base station. If you're on a device with cellular service, make sure that cellular data is turned on from Settings > General > Cellular.
Note: If connected to cellular data, larger items may not download. You may need to connect to Wi-Fi to download apps, videos, and podcasts.
Make sure that you have an active Internet connection. You can check the user guide for your device for help with connecting to the Internet.
Make sure that other devices (portable computers, for example) are able to connect to the Wi-Fi network and access the Internet.
Try resetting (turning off and then on again) your Wi-Fi router.
If the issue persists, try troubleshooting your Wi-Fi networks and connections.
Can't connect to the iTunes Store
-Jason H.  

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