These are unrelated, but creating more then one topic feels wrong.
Anyways, in (2.661):
In mt-search.pm, on line 24, App::Search is created but not given a directory parameter explicitly. In my case it seems to fail to find mt-db-pass.cgi because of that so all searches fail. Adding "Directory => $MT_DIR" fixed the problem for me.
In lib/Entry.pm on line 246, it decides to add anchor based on archive_type_preferred alone, while it should also check @_ (archive_type attribute) to be 'Individual' -- doing that fixed links like "Archive/000001.html#000001#more" for me. (here's when it pops up: preferred archive is daily, but I want "Continue reading" links to point to individual archive, it's nicer).
would be very nice if these get fixed in some future release.