I’ve had the same problem everyone else with a Slim Folio has had where after the 15.1 update, the Facebook app freezes when you try to comment. I, too, tried the fix suggested by turning on Full Keyboard access but just as everyone else found out, it caused other problems. Today, I finally discovered the fix and I’m sad to say it was so easy. All you need to do is go into your Bluetooth settings, click Forget This Device. Then, reboot your iPad, and then go back to Bluetooth settings and pair the Slim Folio again. I had to press the battery button on the Slim Folio in order to see Slim Folio as an available device in Bluetooth settings. Type in the 6-digit pin, press enter, and it works!