Special:Badtitle/NS90:Forum:Tech Wishlist And Bug Reports/Lots of internal errors

Starting today, somewhere around 50-70% of page loads are giving me some kind of internal error (Fatal exception of type MWException). That includes trying to edit or save a page, which is extra annoying. Is it because we've been hammered by spambots? I see a lot of registration and greeting entries in the recent changes (all of which look suspicious to me, though I guess I shouldn't judge too hard -- "NotaBene" probably fits some kind of pattern...).