Hello Luke,
I checked out the urbanpark site and it looks like all the topic index pages are created the same way. One picture and the links + description to the pages...
in tcl/upo-cm.tcl it says:
# the topic page is templated; it lives in www/content/index.
# it optionally takes a topic_id parameter, which tells it which
# topic to display.
Could you upload this index page to the openacs file-storage?
Thanks