I'm using the Pro version of FBReader on my new 360+ with no problems. Wrist turns work fine. Sometimes they stop working after 4 or 5 times of use then I get the FBReader popup box up and choose the black square in the middle and it starts working again.
(Just turn the device almost a quarter turn and hold it there until the green light comes on and when the light goes off turn the device back again and the page turn should work.)
I have it set for 20%.