yeah, i've seen this too (r18161)... thought it was due to some things i've been working on maybe... (nothing major really mostly the autorate stuff)... will run some test builds today with 'stable(edit:done r18086 is working ok)'+'next(edit: done r18217 worked ok)' and the current file mods to try to pin down where it's coming from...
edit: re-testing with r18161 first worked and then didn't which could mean the above tests are now void and need to be repeated more thoroughly... (bugger)
for a workaround you can ssh in and run /etc/init.d/rpcd restart
or
use an incognito/private-browsing window
or
just revert back to the stable version...
possibly related (tentative: i'm having a bad run so don't quote me on that)