Not a super-critical bug as i imagine not many people actually would notice but i see that in Corona 9 that when changing light units with IR running, the behaviour of the corona light doesnt change to match the new unit until you restart IR.
Hard to communicate what i mean by behaviour exactly but Obviously if i pick lumens as my unit, the Lux of the surface the light is covering reduces, the larger the light gets whereas W/sr.m^2 maintains the same lux level on surface regardless of light size. This is how it should be. However, until IR is restarted, the light does not change the way it outputs the light.
Im sure very few people would ever notice this unless you had a decent grasp of the light units and what they actually measure but thought id point it out.