the problem is not clear to me,
if you want to adventure i would start with the line at error.log. do you see the API ad_progress_bar_begin?
procedure "ad_progress_bar_begin" line 6)
invoked from within
"ad_progress_bar_begin -title "Installing Packages" -message_1 "Installing selected packages, please wait ..." -message_2 "We will continue automati..."
("uplevel" body line 18)
invoked from within
or just listen to gustaf:
"I would recommend to upgrade to a newer version of OpenACS and to use Aolserver 4.5.1 instead of 4.5.0."
and get yourself out of it ;)