wine users - Aug 2009 - Possible multicast problem with UPnP Media Server

I'm trying to run Asset UPnP media server under Wine 1.1.27 on Ubuntu 8.04. 
The problem is that media clients on the same network don't appear to SSDP
discover this media server.  The server itself *does* advertise itself fine on
the network though (but as this is fairly infrequent, then any clients can be
hanging around for quite some time before they spot the server).

I've tried other Linux-based media servers running natively on this
particular Ubuntu box and all is good, and I've also run Asset fine on a
Windows-based PC on the net.

Running a Wireshark trace it appears as if the Wine-based Asset server is not
responsing to client SSDP requests. These requests are multicast.

So my question is - are there any known issues regarding multicast with apps
running under Wine? Can they respond to multicast requests? I've had a look
through the various Wine options and I can't see any obvious settings...

Oh - I've tried the network suggestion in the Wine FAQ as well (change
/etc/hosts entry for fqdn hostname from 127.0.1.1 to the correct
network-connected ip address), no luck.
There's no issues with non-multicast operations from the server - once the
clients finally discover it. all works great. It just seems to have issues
responding to multicast on the network.