PermissionsEX help!

Hello, i instal PEX on my server and configure it.
I have 2 questions:
1) if "createUserRecords: true" then new user should appear in permissions.yml , is it true ?
2) i want disable TNT and i write: - -modifyworld.blocks.place.tnt(or 46)

in permissions.yml:

Code:

......
    Minecrafter:
        prefix: '&0(&8M&7inecrafter&0)&7 '
        default: true
        permissions:
        - -modifyworld.blocks.place.tnt
        - modifyworld.*
        - commandbook.give
        - commandbook.give.other
        - commandbook.give.infinite
        - commandbook.give.stacks
        - commandbook.give.stacks.unlimited
        - commandbook.home.teleport
        - commandbook.home.set
        options:
            rank: '900'
......

but tnt blocks placed((( it not works...(change position does not help)
how solve this problem ? sory for my bad english and thanks in advance

all configs: (config.yml, permissions.yml, and modifyworld config)

Code:

permissions:
    backends:
        file:
            file: permissions.yml
    backend: file
    superperms:
        parent-nodes: true
        enable: true
        strict-mode: false
    modifyworld:
        enable: true
        itemRestrictions: true
    informplayers:
        modifyworld: true
        changes: true
    createUserRecords: true
    allowOps: false
    debug: false
    basedir: plugins\PermissionsEx

Code:

groups:
    Read-Only:
        default: false
        options:
            rank: '1000'
        permissions:
        - modifyworld.chat

    Minecrafter:
        prefix: '&0(&8M&7inecrafter&0)&7 '
        default: true
        permissions:
        - modifyworld.*
        - commandbook.give
        - commandbook.give.other
        - commandbook.give.infinite
        - commandbook.give.stacks
        - commandbook.give.stacks.unlimited
        - commandbook.home.teleport
        - commandbook.home.set
        options:
            rank: '900'

    AdvMineCrafter:
        prefix: '&0(&eAdvMineCrafter&0)&7 '
        inheritance:
        - Minecrafter
        default: false
        permissions:
        - modifyworld.*
        - commandbook.say.*
        - commandbook.msg
        - commandbook.time
        - commandbook.weather
        options:
            rank: '800'

    Administrator:
        inheritance:
        - AdvMineCrafter
        prefix: '&0(&1Admin&0)&7 '
        default: false
        permissions:
        - modifyworld.*
        - worldedit.*
        - commandbook.*
        - worldguard.*
        options:
            rank: '100'

    Owner:
        default: false
        prefix: '&0(&4Owner&0)&7 '
        permissions:
        - '*'
        options:
            rank: '0'

users:
    VVSWarHead:
        group:
        - Owner
   ......

Code:

enable: true
informPlayers: true
whitelist: false
itemRestrictions: true
messages:
    prohibitedItem: You have prohibited item "%s".
    whitelistMessage: You are not allowed to join this server. Goodbye!
    permissionDenied: Sorry, you don't have enough permissions
    whitelist: You are not allowed to join this server. Goodbye!
use-material-names: true
check-metadata: true
drop-restricted-item: true
item-use-check: false