It’s a long thread, so I’m not sure what’s already been covered but for several weeks now, when I use the forum’s notoriously dodgy search function, I’ve been finding that clicking on the “Older Threads” link to view another page of results, gives an “Oops something went wrong” (page not found?) error.
Consequently it can be impossible to track down old threads unless you get a hit on the first page or results.
— Edit —
Something else I’ve just come across. With the forum’s message section, I can only view the top message in the list of senders, clicking on other message authors doesn’t select their messages or allow you to view them (I have a tracking number I want to retrieve from a message and can’t, so it’s a tad annoying).