[twill] twill bug

[Leonardo Santagada]

I want to automate somethings in www.sabi.ufrgs.br. Look at what is
happening:

$ twill-sh

 -= Welcome to twill! =-

current page:  *empty page*
>> go http://www.sabi.ufrgs.br/

ERROR: invalid literal for int(): refresh

current page:  *empty page*

and if I try:
>> go http://slashdot.org/
==> at http://slashdot.org/
current page: http://slashdot.org/

so my twill-0.8.4a9 is working, but not to this site... is there any way
to use twill on it, or is this a bug?