I was trying to search or browse through trac to look for a ticket. But I got errors when trying to page past the first page when browsing and when trying to click on bug searches by plugin. This link illustrates the problem. Screenshot attached.
jQuery UI's current Trac is not without its own peculiarities, one of which is that it tends to work a lot better when you're logged in. Can you try creating an account and logging in and see if that helps with your problem?