You might need to contact our support team Monday for help with this. We're all at Oshkosh, it's hard to diagnose/debug on the road, and this is not something I've heard of before.
Some things to try:
1) During a demo yesterday I accidentally had 2 versions of the app running at the same time. That shouldn't be possible, but clearly it is - and it can causes strange unpredictable problems. The v8 startup sequence is longer. If you have your device setup to launch automatically, do a cold boot and just wait...don't manually launch the app. If it doesn't auto-launch, make sure you are touching the iFly icon only once...and wait. We're going to fix this issue in a patch soon.
2) To correct a corrupt file you will need to re-download the software. If you are comfortable navigating files on an SD card, you can try going to the \Navi folder and deleting software.txt, then use iFly connect to update software again. If you are not comfortable, wait for our support guys to help.
3) If it's a settings problem you can reset your settings to factory defaults by renaming your \User folder to \UserBackup. iFly will create a fresh one with default settings. But like #2, wait for help if this sounds confusing to you.
Hope this helps,
Walter