[Edit: Issues, Bugs, and Requested Features should be tracked at Google Code, not here -- matt, 2010-04-23]
Less Wrong is still under construction. Please post any bugs or issues with Less Wrong to this thread. Try to keep each comment thread a clean discussion of each bug or issue.
Requested features... sure, go ahead, but bear in mind we may not be able to implement for a while.
It's been broken for me, too.
The problem may be associated with comments from a time period-- recent comment is working for me now, but I can't page back.
For reference, it's usually the fault of one particular comment - when this happens, finding any page with that comment will break the site. "Recent comments" works again when that comment falls off the first page.