Strange behavior with large datas

I'm trying to bring up a production system using postgresql and cygwin.

I'm using the latest cygwin packages (as well as cygipc 1.09-2)

Installation was done without any problem. Evrything works smoothly
except queries on tables containing large toasted values. a select on such a
table will Hang (client locked, use the attached test script to reproduce).
I have tried with an earlier version of postgres (7.1) as well as current
CVS : same problem.
I found that downgrading cygwin package to cygwin 1.3.1-1 does remove
this problem.

But with cygwin 1.3.1, there another strange behavior : in one
transaction, I create 20 record with quite large toasted values in them
(~30Ko each in 2 fields). Transaction commit take a very long time (5-10 s).

Any Idea will be welcome,

thanks

cyril

test script :

create table test (tf test);

insert into test (tf) values ('aaaaaaaaaa');
update test set tf=tf||tf||tf||tf||ff||tf||tf||tf||tf||ff
update test set tf=tf||tf||tf||tf||ff||tf||tf||tf||tf||ff
update test set tf=tf||tf||tf||tf||ff||tf||tf||tf||tf||ff
update test set tf=tf||tf||tf||tf||ff||tf||tf||tf||tf||ff

select tf from test -> Hang