Originally posted by hitech
How are they mapped, as buttons or key strokes?
As buttons using in-game mapping. RPM Increase under Flight Controls is button 25. RPM Decrease is button 23.
What do you do exactly to fix the problem?
I open the stick map setup screen and press each of the two buttons on my throttle (buttons 16 and 14 in my CH profile). Their corresponding squares -- 25 and 23 -- light up on the flip-out panel. Voila! I now have RPM control again.
Complicating factor: I flew a sortie in the CT earlier today and the problem did not appear, making it possibly intermittent and harder to pin down.

Also, I was mistaken about it starting with Patch 5. We were in Patch 4 when I first noticed it ... flying A6M2 in CT last week ... but it happened with every sortie latter half of week, and with first and only sortie this week (in Seafire).
I have made no recent changes to my programming or mapping, either in CH Manager or in-game.
Splash1