OpenACS improved the Ticket Tracker and released it as "new-ticket". It will have that URL untill we decide what to do with it.
The new-ticket has several enhancements over the regular ticket tracker and is part of a bigger module that Ben is building - BITS (Bug and Issue Tracking System). With new-ticket, your issues are assigned to your "todo" list (/todo).
To get it going, you need to create a "team" first. Go to "/team" and create a team. Then visit "/new-ticket" and you should be able to see it.
new-ticket is being worked on and we are hoping to release an improved version by the time OpenACS final comes out, in about two weeks.