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Just recently, whenever I load up the Q400 in P3Dv4.3, the condition levers go to max. When I use my mouse to set them back to idle and look somewhere else in the cockpit, they go right back to max. I keep on bringing them back to no avail.
Do you have any input devices that could be assigned to the condition levers... This usually is the common cause of this problem. If this is the case, disable the assignment via P3D's control section.