The problem with NAT and version

I have simple test- config SRX210

interfaces {
    ge-0/0/0 {
        disable;
    }
    ge-0/0/1 {
        disable;
    }
    fe-0/0/2 {
        unit 0 {
            family inet {
                address 192.168.52.1/24;
            }
        }
    }
    fe-0/0/3 {
        disable;
    }
    fe-0/0/4 {
        disable;
    }
    fe-0/0/5 {
        disable;
    }
    fe-0/0/6 {
        disable;                       
    }
    fe-0/0/7 {
        description ISP-1;
        unit 0 {
            family inet {
                address 192.168.230.133/24;
            }
        }
    }
    lo0 {
        unit 0 {
            family inet {
                address 127.0.0.1/32;
            }
        }
    }
}
routing-options {
    static {
        route 0.0.0.0/0 next-hop 192.168.230.1;
    }
}
protocols {
    stp;
}
security {
    flow {
        tcp-mss {
            ipsec-vpn {
                mss 1350;
            }
        }
    }
    screen {
        ids-option untrust-screen {
            icmp {
                ping-death;
            }
            ip {
                source-route-option;
                tear-drop;
            }                          
            tcp {
                syn-flood {
                    alarm-threshold 1024;
                    attack-threshold 200;
                    source-threshold 1024;
                    destination-threshold 2048;
                    timeout 20;
                }
                land;
            }
        }
    }
    nat {
        source {
            rule-set trust-to-untrust {
                from zone trust;
                to zone untrust;
                rule source-nat-rule {
                    match {
                        source-address 192.168.52.0/24;
                        destination-address 0.0.0.0/0;
                        protocol [ tcp udp icmp ];
                    }
                    then {
                        source-nat {
                            interface;
                        }
                    }
                }
            }
        }
    }
    policies {
        from-zone trust to-zone untrust {
            policy trust-to-untrust {
                match {
                    source-address any;
                    destination-address any;
                    application any;
                }
                then {
                    permit;            
                }
            }
        }
    }
    zones {
        security-zone trust {
            address-book {
                address LOCALNET 192.168.52.0/24;
            }
            host-inbound-traffic {
                system-services {
                    all;
                }
                protocols {
                    all;
                }
            }
            interfaces {
                fe-0/0/2.0;
            }
        }
        security-zone untrust {
            screen untrust-screen;
            host-inbound-traffic {
                system-services {
                    ssh;
                    ike;
                    ping;
                    https;
                    http;
                }
                protocols {
                    all;
                }
            }
            interfaces {
                fe-0/0/7.0;
            }
        }
    }
}

version 12.1X46-D50.4 not working ....
  On the hostin the network192.168.230.0 I see"untranslated"packets   192.168.52.0

version 12.1X44-D30.4  OK! .... -packetsare transmittedas a  192.168.230.133