Host not found: 3(NXDOMAIN)

I keep having trouble with this one. I have implemented DNS with DHCP update on my Linux Slackware distro 14.1, bind version 9.9.3. I did have this working once, I was able to resolve dhcp clients:

$ host hplaptop
hplaptop.hprs.local has address 192.168.0.100

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I don't know that I've done anything at all to this basic bind/dhcpd configuration, but now I cannot resolve them:

$ host hplaptop
Host hplaptop not found: 3(NXDOMAIN)

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I need help!

My named.conf:

options {
        directory "/var/named";
        forwarders {            // These are the ISP provided name servers
            66.193.88.3;
            66.192.88.4;
        };

        allow-query {           // Permit querying by others in the domain
            192.168.0.0/24;
            127.0.0.1;
        };
};

zone "localhost" {
        type master;
        file "db.local";
};

zone "127.in-addr.arpa" {
        type master;
        file "db.127";
};

zone "hprs.local" in {
    type master;
    allow-update { 192.168.0.2; 127.0.0.1; };         // local DHCP server
    file "db.hprs.local";
};

zone "0.168.192.in-addr.arpa" in {
    type master;
    allow-update { 192.168.0.2; 127.0.0.1; };           // local DHCP server
    file "db.192.168.0";
};

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Zone file /var/named/db.hprs.local

$ORIGIN .
$TTL 14400      ; 4 hours
hprs.local              IN SOA  mail.hprs.local. sysadmin.mail.ohprs.org. (
                                3          ; serial
                                10800      ; refresh (3 hours)
                                3600       ; retry (1 hour)
                                604800     ; expire (1 week)
                                3600       ; minimum (1 hour)
                                )
                        NS      mail.hprs.local.
$ORIGIN hprs.local.
$TTL 14400      ; 4 hours
mail                    A       192.168.0.2
$TTL 14400      ; 4 hours
richo                   A       192.168.0.20

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dhcpd.conf:

authoritative;

ddns-updates on;
update-static-leases on;
allow unknown-clients;
ddns-update-style interim;
default-lease-time 86400;

zone hprs.local. { primary 192.168.0.2; }
zone 0.168.192.in-addr.arpa. { primary 192.168.0.2; }

subnet 192.168.0.0 netmask 255.255.255.0 {
    option routers 192.168.0.2;
    range 192.168.0.100 192.168.0.254;
    option domain-name-servers 192.168.0.2;
    option domain-name "hprs.local";
    ddns-domainname = "hprs.local.";
    ddns-rev-domainname = "in-addr.arpa.";
}

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Releasing/renewing the client appears to work:

Jul 24 16:07:01 mail named[4966]: client 192.168.0.2#62764: updating zone '0.168.192.in-addr.arpa/IN': deleting rrset at '100.0.168.192.in-addr.arpa' PTR
Jul 24 16:07:01 mail dhcpd: DHCPRELEASE of 192.168.0.100 from 00:25:b3:bf:f5:42 (hplaptop) via eth1 (found)
Jul 24 16:07:01 mail dhcpd: Removed reverse map on 100.0.168.192.in-addr.arpa.
Jul 24 16:07:01 mail dhcpd: DHCPDISCOVER from 00:25:b3:bf:f5:42 via eth1
Jul 24 16:07:01 mail dhcpd: DHCPOFFER on 192.168.0.100 to 00:25:b3:bf:f5:42 (hplaptop) via eth1
Jul 24 16:07:01 mail named[4966]: client 192.168.0.2#62764: updating zone '0.168.192.in-addr.arpa/IN': deleting rrset at '100.0.168.192.in-addr.arpa' PTR
Jul 24 16:07:01 mail named[4966]: client 192.168.0.2#62764: updating zone '0.168.192.in-addr.arpa/IN': adding an RR at '100.0.168.192.in-addr.arpa' PTR
Jul 24 16:07:01 mail dhcpd: DHCPREQUEST for 192.168.0.100 (192.168.0.2) from 00:25:b3:bf:f5:42 (hplaptop) via eth1
Jul 24 16:07:01 mail dhcpd: DHCPACK on 192.168.0.100 to 00:25:b3:bf:f5:42 (hplaptop) via eth1
Jul 24 16:07:02 mail dhcpd: Added reverse map from 100.0.168.192.in-addr.arpa. to hplaptop.hprs.local

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But I can't resolve hplaptop from the Linux DNS server and there is no db.hprs.local.jnl file created.

Interestingly, a db.192.169.0.jnl file *is* created and I can resolve by IP:

$ host 192.168.0.100
100.0.168.192.in-addr.arpa domain name pointer hplaptop.hprs.local.

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Please help! I'm stuck!