Ok, I waited a while and no one seems to be reporting this.
If going to the second page (Older link) of any hotposts there is a 404 error.
Using the Boston board as an example (which I don't care about losing the hot posts)
I can get to subsequent pages by changing the url from
[BROKEN LINK REMOVED]
When trying to mark hot posts as read, I get the error reported in User Help