Bukkit

I can't sit on a chair, the config is not false.

What is the expected output? What do you see instead?
Nothing!

What version of the product are you using?
v4.4 and v4.3
Spigot 1.7 (and 1.8)

Do you have an error log of what happened?
[01:57:30] [Server thread/INFO]: thomi100 issued server command: /chairs reload
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: WOOD_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: SPRUCE_WOOD_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: JUNGLE_WOOD_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: BIRCH_WOOD_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: SANDSTONE_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: COBBLESTONE_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: BRICK_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: SMOOTH_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: NETHER_BRICK_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: QUARTZ_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: ACACIA_STAIRS => 0.7
[01:57:30] [Server thread/INFO]: [Chairs] Allowed block: DARK_OAK_STAIRS => 0.7
[01:58:00] [Server thread/INFO]: ._. >  Du kannst den Server auch mit der 1.8 betreten!
[01:58:29] [Server thread/INFO]: thomi100 issued server command: /chairs reload
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: WOOD_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: SPRUCE_WOOD_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: JUNGLE_WOOD_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: BIRCH_WOOD_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: SANDSTONE_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: COBBLESTONE_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: BRICK_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: SMOOTH_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: NETHER_BRICK_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: QUARTZ_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: ACACIA_STAIRS => 0.7
[01:58:29] [Server thread/INFO]: [Chairs] Allowed block: DARK_OAK_STAIRS => 0.7

Please provide any additional information below.

If I klick on a stair (with signs) it dosent work!
I am Owner and I have the permission * (PEX).
My Config:
sit-blocks:
- WOOD_STAIRS:0.7
- SPRUCE_WOOD_STAIRS:0.7
- JUNGLE_WOOD_STAIRS:0.7
- BIRCH_WOOD_STAIRS:0.7
- SANDSTONE_STAIRS:0.7
- COBBLESTONE_STAIRS:0.7
- BRICK_STAIRS:0.7
- SMOOTH_STAIRS:0.7
- NETHER_BRICK_STAIRS:0.7
- QUARTZ_STAIRS:0.7
- ACACIA_STAIRS:0.7
- DARK_OAK_STAIRS:0.7
valid-signs:
- SIGN
- WALL_SIGN
- SIGN_POST
- ITEM_FRAME
auto-rotate: true
max-chair-width: 3
sign-check: true
distance: 2
ignore-if-item-in-hand: true
disabledWGRegions:
- exampleregionname
sit-effects:
  healing:
    enabled: false
    interval: 20
    amount: 1
    max-percent: 100
  itempickup:
    enabled: true
sit-restrictions:
  commands:
    all: true
    list:
    - /examplecommand
notify-player: true
messages:
  sitting: '&7You are now sitting.'
  standing: '&7You are no longer sitting.'
  occupied: '&7This seat is occupied by &6%PLAYER%&7!'
  reloaded: Chairs configuration reloaded.
  no-permission: '&cYou do not have permission to do this!'
  enabled: '&7You have enabled chairs for yourself!'
  disabled: '&7You have disabled chairs for yourself!'
  command-restricted: '&7You can''t issue this command while sitting'

Thank you very much!

i've noticed that that sometimes it won't recognize some configurations of chairs.

have you tried sitting on a singe stair block, facing in N,S,E,W directions separately?

[unsure if related] set spawn-protection to 0?