Whenever views are switched with the Enter key, they mouse cursor's location seems to set the focus and therefore the arrow keys may not respond as expected. So in order to solve this problem I would suggest that pressing Enter would highlight the most obvious thing in the next view and the mouse cursor would be ignored until it is used again.
For example the single channel EPG view tends to require pressing Up key once before the Down or PageDown keys work.
For example the single channel EPG view tends to require pressing Up key once before the Down or PageDown keys work.