Anyone else having sporadic problems with "Roaming User" uploads?

I'm having problems with the new "Roaming User" feature (aka roaming 
profiles) in Moz 1.8a5 on OS X 10.3.7. I have a NAT'd router between me 
and my DSL service

When I exit Moz, it appropriately tries to upload various profile data. 
  Sometimes the upload works, sometimes it doesn't.   You can see the 
various resulting error messages at:

   http://www.benslade.com/misc/BadProfileUpload.png

The behavior is, if an upload works, it works immediately, otherwise it 
seems to hang for about a minute waiting before failing.   During the 
wait, the "netstat" command shows something like:

Proto Recv-Q Send-Q Local Address        Foreign Address        (state)
tcp4       0      0 192.168.1.100.50167  freak6.webhostfr.18742 SYN_SENT

When I try and use a manual ftp command at the same time, it always 
works perfectly.   Ie. the manual ftp command never *ever* has errors 
like this.

Is anybody else experiencing this problem?   Any bugzilla/mozilla bug 
numbers you can point me to?

Thanks
Ben in DC
PublicMailbox at benslade dot.com
(append 030516 to the subj to bypass spam filters)
"It's the mark of an educated mind to be moved by statistics"
Oscar Wilde