CRAFTBOOK-3192 - Reported by R4RW

As stated above, the melt-in-sunlight thing doesn't work. And yes, i have partial-melt-only set to false.

Using the latest SNAPSHOT of CraftBook (3.9) and Spigot-1.9.2-R0.1-SNAPSHOT.

EDIT: Oh, and of course i have the Snow Mechanic enabled.

In addition to that, here's the Snow Mechanic in my mechanics.yml:

Snow:
    piling: true
    trample: false
    partial-trample-only: false
    jump-trample: false
    place: false
    slowdown: true
    realistic: false
    high-piling: false
    max-pile-height: 3
    replacable-blocks:
    - DEAD_BUSH
    - LONG_GRASS
    - YELLOW_FLOWER
    - RED_ROSE
    - BROWN_MUSHROOM
    - RED_MUSHROOM
    - FIRE
    falldown-animation-speed: 5
    freeze-water: true
    melt-in-sunlight: true
    partial-melt-only: false

Comment by me4502

Okay, so looking into it - melting will only occur at temperatures greater than 0.05.

Snow code is also only run in chunks where the temperature is less than 0.15 in order to not cause lag.

On top of this, it can't be raining in order for snow to melt.

In the latest build I have removed the maximum temperature check for snow code running if melt is enabled, which may fix your issue if that is the cause. As well as that, it should lower memory usage by the snow mechanic.