Links in New Posts - are not accessible?
First pic is the post, second is the response page.
Let me make sure I'm reading and interpreting this correctly. You're viewing some post by User Nmselsh and on the right in the Recent Threads window, is a thread entitled "Blue Ox brake assist now free if..." that, I presume, caught your attention. So you clicked on the thread to view it, but instead of it appearing on your screen, you received an error message from vBulletin.
So, you want to why this happened. A fair question and the Site Team members here appreciate you taking the time to ask because, sometimes we don't even know when there's a problem unless someone notifies us or the computer comes to a screeching halt.
I attempted to view this thread myself, just to see if I get the same vBulletin error, but I couldn't find it. A forum search on the words "Blue Ox" yielded me 44 threads containing "Blue Ox" ranging from May 1st of this year back to May of 2011. None of them had a thread entitled of "Blue Ox brake assist now free if...".
So, I apologize for being unable to provide an answer to your question. Based on my findings, I have to think that somewhere between the time the webpage appeared on your screen and when you clicked on that thread to view it, it was possibly renamed, deleted or merged into another thread, thus, making it no longer available.
If by chance, you see this thread appear again, please let us know.