No display of data

Hi, somewhat sorry for having to open up so many issues...

But I worked around the two other reported bugs now and got a functioning install. The admin page displays, and changes in the selected items also reflect in the database table (I can't use views due to MySQL 4.1). But if I access www.mysite.com/site_user_list I just get a page with the caption "Site user list" and the content text "Array". No data whatsoever.

Help would be very much appreciated...