Unknown winsock error 10061

After upgrading to 8.4 on Vista I see no progress on the shared memory
problem unfortunately.

I think it's even worse now (previously it happened mainly when OS
went to sleep & then was restored, now it's all the time).

My log looks like this.
----------------------------------------------------------------------------------------------------------------------------------------------
FATAL: could not reattach to shared memory (key=288, addr=02A00000):
487
2009-07-06 11:39:45 CESTLOG: could not receive data from client:
Unknown winsock error 10061
2009-07-06 11:39:45 CESTLOG: unexpected EOF on client connection
FATAL: could not reattach to shared memory (key=288, addr=02A00000):
487
2009-07-06 11:40:20 CESTLOG: could not receive data from client:
Unknown winsock error 10061
2009-07-06 11:40:20 CESTLOG: unexpected EOF on client connection
2009-07-06 11:40:20 CESTLOG: could not receive data from client:
Unknown winsock error 10061
2009-07-06 11:40:20 CESTLOG: unexpected EOF on client connection
-----------------------------------------------------------------------------------------------------------------------------------------------

Our application runs on Linux in the production environment, but all
the developers works on Windows with local PG installations. Some of
them are getting the error - some don't.
.
It's really big problem explaining to the people that PG is really
good database.

Is there any chance to do something with it?