Single host (or hosts) scan seems to hang

Greetings,

I'm running a client Nessus 3 (v3.2.1.1) on an XP SP2 box and going
against a FreeBSD6 v3.2.0 version of Nessus and the scan starts but
never stops (this against a single host, ms security bulletins and lasts
> 1 hour).

Anyone have an idea of why this seems to hang up?

Nessusd.message excerpt:
 [Wed Sep 17 09:22:09 2008][1542] connection from 10.0.0.15
[Wed Sep 17 09:22:09 2008][1558] Client requested protocol version 12.
[Wed Sep 17 09:22:09 2008][1558] successful login of nessusdood from
10.0.0.15
[Wed Sep 17 09:22:09 2008][1558] Redirecting debugging output to
/usr/local/nessus/var/nessus/logs/nessusd.dump
[Wed Sep 17 09:22:09 2008][1558] user nessusdood starts a new scan.
Target(s) : 10.0.0.53, with max_hosts = 20 and max_checks = 5
[Wed Sep 17 09:22:09 2008][1558] user nessusdood : testing 10.0.0.53
(10.0.0.53) [1561]
[Wed Sep 17 09:22:09 2008][1558] 0 TCP sessions in parallel
[Wed Sep 17 09:22:09 2008][1561] user nessusdood : launching
dont_scan_settings.nasl against 10.0.0.53 [1]
[Wed Sep 17 09:22:09 2008][1561] user nessusdood : launching
clrtxt_proto_settings.nasl against 10.0.0.53 [2]
[Wed Sep 17 09:22:09 2008][1561] user nessusdood : launching
ssh_settings.nasl against 10.0.0.53 [3]
[Wed Sep 17 09:22:09 2008][1561] dont_scan_settings.nasl (process 1)
finished its job in 0.000 seconds
[Wed Sep 17 09:22:09 2008][1561] clrtxt_proto_settings.nasl (process 2)
finished its job in 0.000 seconds
[Wed Sep 17 09:22:09 2008][1561] ssh_settings.nasl (process 3) finished
its job in 0.000 seconds
[Wed Sep 17 09:22:09 2008][1561] user nessusdood : launching
cifs445.nasl against 10.0.0.53 [4]
[Wed Sep 17 09:22:09 2008][1561] cifs445.nasl (process 4) finished its
job in 0.000 seconds
[Wed Sep 17 09:22:09 2008][1561] user nessusdood : launching logins.nasl
against 10.0.0.53 [5]
[Wed Sep 17 09:22:09 2008][1561] logins.nasl (process 5) finished its
job in 0.000 seconds
[Wed Sep 17 09:22:09 2008][1561] user nessusdood : launching
ping_host.nasl against 10.0.0.53 [6]  
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