Jeromy's right about those white buttons (fire, bomb, soldier and tank controls). Since the last release, I've been fumbling so much that I've wondered if they are working right. The problem is you can't see them when the background is snow. The old buttons worked, no need to change from the old way IMO.
Manfred
Edit: Mine is on a Samsung S4, the new January 2015 Android release 4.4.4, and DF 4.4.58, using Simple cockpit with motion controls.