Still unresponsive.
Tried to be a bit methodical in the touch input if that helps any.
- Tap 4 corners: top left, top right, bottom left, bottom right (may have mixed up the bottom ones)
- Tap center edges (cross pattern): top center, bottom center, left center, right center.
- Horizontal swipes (l to r): top, center, bottom
- Vertical swipes (t to b): left, center, right
- Diagonal swipes: top left - bottom right (& vice versa), top right - bottom left (& vice versa)
I may have switched #4 and #5. Ugh, I'm too young for my memory to be failing.