I click on an email and nothing happens, only gives me an option to delete or file?
Is it a single email or all within an account?
Start by refreshing your Hub...in the hub swipe diagonally down from top right corner about 4 or 5 times to refresh.
if it's an entire account it could be server related or you may have to delete account and set it back up again.
Is there any difference between WiFi and network attempts?
Try a "hard reboot"of device.
Hold power button down for about 20-30 seconds until red LED flashes and BlackBerry bootloader reappears.