11
Found the solution, in this thread, see the post by SLEO577 on Dec. 12/2005:
https://xoops.org/modules/newbb/viewtopic.php?topic_id=43649&start=0#forumpost200436
(basically, in modules administration, in the System row, click on the "update" icon - ie. the icon in the right column, just to the left of the "info" icon. This will bring back the links.)
Anyone know why this works?