Right, that link is now operational.
It's impossible to "fix it" though, as strictly speaking it's not a bug and nothing is broken, it's an anomoly caused by certain specific thread titles being used that coincide with the title of a previous thread, which is basically confusing the system and making the link clash and not work properly.
The only current fix, which is a doddle to do, is basically to edit the title of the latest thread that your trying to visit, so that it doesn't clash any more.
I will be speaking to the
SEO developers to see if they have any kind of change to their next version code, to change the way that kind of link works completely, therefore meaning that the next version would not have that issue being able to happen.