[R] Problem with print()

[Amparo Albalate]

Dear R-users,
I´m having for the first time a problem while printing out values in the 
screen,
I have a function wich takes quite a long time to execute, and I thought 
it´d be useful to insert a print statement inside the main loop to keep 
control of the current iteration,
however, for some reason, the prints() are not shown in real time, and 
only when I stop the execution, all prints  up to the current iteration 
are shown. This never happened before,
but we observed this problem today (in a machine with vista).
Maybe any of you has experienced the same problem and/or has any idea?

Thanks in advance!