[twitter-dev] Twitter API "blocks/exists" does not work

[Jim]

Hello All,
When accessing the blocks/exists api, I do not get valid reponses:

In the console:

{
  "request": "/1/blocks/exists.json",
  "error": "Not found"
}
(example:
http://dev.twitter.com/console/recall?client_application_id=144824&content_type=json&method=GET&param-keys[]=id&param-vals[]=twitterapi&path=blocks%2Fexists&version=1)

When using xAuth:
{"request":"/1/blocks/exists.json?
screen_name=twitterapi","error":"Incorrect signature"}

All my other requests (including authentication and posting) work just
fine.

Any ideas?
Thanks,
Jim