Certainly, third party keyboards are a real testament to how customizable Android can be out of the box. Since KitKat’s rollout, however, people have noticed that the default input method reverts to the default keyboard when updating a paid keyboard app. Worse still, the keyboard you updated actually ends up disabled.
Symptoms
What’s interesting about this bug is that it seems to only affect the paid flavor of these apps. Free versions should go unaffected.

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[Bug Watch] KitKat Disables Paid Keyboard Apps Upon Updating Them, Reverts To Default Keyboard was written by the awesome team at Android Police.