Whenever you click on the title of a thread that uses three ellipsis in its title, the server cocks up. However, it's not necessary to show the thread title as part of the linked url for a topic to work.

It uses this form atm

showtopic.php?[thread_id][thread_name]/page[page_number]

All you need to do is get rid of the piece of code that inserts the [thread_name] variable into the url, making it

showtopic.php?[thread_id]/page[page_number]

and it should work in exactly the same way, but without the ellipsis problem. Simple fix, big problem solved.