[imp] viewer tourbles

[giangy]

what I get when try to see an attachment is:


a blank window with:
"
Fatal error: Call to a member function on a non-object in
/var/www/horde/imp/view.php on line 77
"
in it

with all kind of mime type but html
(so no gif no jpeg no work etc etc)

any ideas?


config
horde-2.1
imp-3.1
I don't think it matters but: 
apache-1.3.26 php-4.2.3

I did not find anything similar in list archive...

tia
gianluca