Hello Hannah, thank you for your response on the matter.
The X-out seems to occur as soon as any London Heathrow CTA comes into view. This would be very problematic if I were planning a flight to say, Biggin Hill, and all of a sudden my airport data disappears while on approach as Heathrow comes into view...
I have taken some screenshots of what I think may be relevant NOTAM's. Could it be the addition of the North Korean Airspace warning, or perhaps some other airspace restriction over London itself?
Either way - it could be a dangerous problem for an overseas pilot where the problem first occurs on appoach to a London airfield. I myself expect to fly into the area more often as well.
Love your software though - integrated flight plan submission was absolute gold so far...
Thanks, and good luck bug-hunting!
P.S. - OS is latest iOS running on iPad Mini (original), problem also occurs on iPhone 4S.