Bukkit

Is the problem reproducible ? If yes, please describe how
1.
2.
3.

What's the problem ? What should be ?

What version of Seasons,Craftbukkit, (ProtocolLib) do you use ?
Seasons - v2.0.3
Craftbukkit -1.5.2-R0.1

Do you have an error log ? If yes, please provide it

Please provide the seasons config.

Seasons:
Spring:
    Visual:
      Textures: ''
      Snow: 0
    ShortName: spring
    Lengths:
      Season: 10.0
      Weather: 0.5
    Percentages:
      Sun: 60
      Rain: 20
      Thunder: 20
    SpecialDays:
      '1': First Day of Summer
      '10': Last Day of Summer
    SnowManagerSpeed:
      Place: 0
      Remove: 100
    Time:
      Day: 14000
      Night: 10000
  Summer:
    Visual:
      Textures: ''
      Snow: 0
    ShortName: summer
    Lengths:
      Season: 20.0
      Weather: 0.5
    Percentages:
      Sun: 70
      Rain: 20
      Thunder: 10
    SpecialDays:
      '1': First Day of Summer
      '10': Last Day of Summer
    SnowManagerSpeed:
      Place: 0
      Remove: 100
    Time:
      Day: 14000
      Night: 10000
Fall:
    Visual:
      Textures: ''
      Snow: 0
    ShortName: spring
    Lengths:
      Season: 12.0
      Weather: 0.5
    Percentages:
      Sun: 50
      Rain: 40
      Thunder: 10
    SpecialDays:
      '1': First Day of Summer
      '10': Last Day of Summer
    SnowManagerSpeed:
      Place: 0
      Remove: 100
    Time:
      Day: 14000
      Night: 10000

  Winter:
    Visual:
      Textures: ''
      Snow: 500
    ShortName: winter
    Lengths:
      Season: 7.0
      Weather: 0.5
    Percentages:
      Sun: 20
      Rain: 70
      Thunder: 10
    SpecialDays:
      '1': First Day of Winter
      '3': Mid Winter
      '5': Last Day of Winter
    SnowManagerSpeed:
      Place: 0.6
      Remove: 0.2
    Time:
      Day: 14000
      Night: 900
Properties:
  Active: true
  LogInfo: true
  Resolution:
    Precision: 0.01
    TimeCheck: 20
  Regen:
    Snow: true
    Ice: true
  Messages:
    ChangeMessage: Seasons changes to <name>.
    SeasonsMessage: You're in <name> for another <number> days.
    SpecialDayMessage: It's <name>.
    Weather: The current weather is <name>.
    Color: b
    NotActive: Seasons are not active in this world.
    Sign:
    - <name>
    - <day>/<length>
    - <specialDay>
    ColorList:
      BLACK: '0'
      DARK_BLUE: '1'
      DARK_GREEN: '2'
      DARK_AQUA: '3'
      DARK_RED: '4'
      DARK_PURPLE: '5'
      GOLD: '6'
      GRAY: '7'
      DARK_GRAY: '8'
      BLUE: '9'
      GREEN: a
      AQUA: b
      RED: c
      LIGHT_PURPLE: d
      YELLOW: e
      WHITE: f
      MAGIC: k
      BOLD: l
      STRIKETHROUGH: m
      UNDERLINE: n
      ITALIC: o
      RESET: r
  Debug: false

Any more informations ?
The seasons cycle right, but when I try to use commands it gives me "Seasons are not active in this world"

Same for me! Except they don't seem to cycle after I reset the server the first time...