Why is the keyboard blocking my boards?

Most likely because you have selected a switch in Settings, but you did not pair your Bluetooth switch.  To use a switch, it first must be paired with your i-Device.  It is is not paired or becomes unpaired, the keyboard will appear.  

See Pairing your Bluetooth Switch: 

http://mytalk.zendesk.com/entries/20581953-pairing-mytalk-tools-3-1-with-ablenet-switch

Re-set:  On some devices a reset is needed after making changes in Settings:

http://mytalk.zendesk.com/entries/315077-after-making-a-settings-change-will-i-need-to-re-set-mytalk