Keyboard disappears if Keyboard Appearance set to "Dark"

Actually, it doesn’t work if you set it to “Default”, “Light” or “Dark”. The keyboard at least doesn’t disappear if set to nothing.

I should say it doesn’t always not work. It seems to work just fine for one of my four Text_Input components. I’ve copied the working Text_Input to the other three, set to “Dark”. They work once, then after that they appear and then immediately disappear. Weird. Any help is always appreciated.
[EDIT] Now I can not get ANY text input to work after setting it to “Dark”, even after changing it back to Default, or removing the setting completely.

DOH! I was setting the column that contained the keyboard to Visible False. All is good with the keyboards now.