Thank you so much, I've tried all sorts to get the keyboard working again. Exactly as you describe, Filter Keys was switch on, switched it off & now all working OK!
We have a dell tablet venue pro 8 with keyboard. we got it a little over a year ago. at that time everything worked. now we changed the dead batteries on the keyboard and now keyboard doesn't work. I can't for the life of me remember how to pair up the keyboard with the tablet. I looked in pc settings for a Bluetooth option but there doesn't seem to be one. there must be one somewhere because we have used the keyboard with the tablet. HELP!
Per the user guide:
Press the Bluetooth button [top button on right side of keyboard] for 3 seconds
Pair the keyboard
1. In the Charms sidebar, tap Settings, Change PC settings, PC and devices, Bluetooth, Add a device.
2. Tap the keyboard name from the list.
3. Follow the instructions on the screen.