Facebooker talk - Aug 2008 - image cache acting weird for anyone?

We''ve got a few random images that seem to have gone missing from the
cache...  They''re used in our profile fbml.  I double-checked the
image specified by the fbml and it exists at the specified URL on our
ruby server, but it''s in the rendered html as
http://photos-b.ak.facebook.com/photos-ak-sctm/genericv2b/1013/17/01AwcA9hJaWykAAAABAAAAAAAAAAA:.jpg
which is a not found...

Renaming the image works, using the API call to refresh the image does
not.  I don''t want to just go randomly renaming stuff and hoping it
doesn''t break again, but I can''t think of anything else to do.
Figured I''d ask if anyone else was having issues...