Been quite happily running LE (currently 9.2.1) on a RPi 3 for a while now. I use an old bluetooth Logitech DiNovo keyboard which has never given me any problems either. In the middle of a show today, the keyboard lost it's connection to LE. No big deal, I thought, I'll just plug in a USB keyboard and go in and disconnect / reconnect it in the settings. Thsi is where the fun begins. When I select Bluetooth from the LEs setting menu, I get a blank panel where the device list should be. The really strange thing is that, although I can still move the cursor around, the remainder of the options in the LE Settings menu now also present blank panels. Additionally, I can't back up a level, effectively getting stuck in the LE settings. I then have to either pull power from the RPi or SSH in and restart it - if it will let me SSH. Several times, after the machine goes heywire on the bluetooth selection, it's dropped the SSH connection as well and any further attempts time out.
Hope that makes sense to someone. Also, I have onnected the keyboard to several windows machines and a linux PC with no problems at all, so it's not the keyboard.
Any help would be greatly appreciated. I really don't want to rebuild this thing from scratch if I don't need to...