Weird trouble with select

Hi!

I have  3  pc's:
pc 'A'  with postgres 7.2 running
pc 'B' and 'C'  connected to  'A'




if i made  the next query on 'B' or 'C' :  "select * from detail with
id=72";  takes too long time to  return the data, near of 10 minutes
more or less.
if i made  the next query on 'B' or 'C' :  "select * from detail with
id=71",  or whatever value in id , the data are returned immediatly.

if i made  the next query on 'A'  (postgres server):  "select * from
detail with  id=72", the data are returned immediatly.


i tried to recreate de database ( drop and create), but i got the same
result on  'B' and 'C' pc's.


But when  i made the query on another scenary ( 'D'  and 'E' with 'F'
like postgres server)  with the same database  the works fine.


So i am   intrigued,  i checked the  network connection but looks fine,
if you can  help me with this, i will  thankfull with you!

Regards, e-ddie.