Facebooker talk - Jan 2009 - Session key invalid or no longer valid on Photos.upload occasionally?

Hi everyone,

The app I''m working on is pretty much centered around posting photos to
users'' photo albums.

We seem to be getting a rare and random session key error on Photos.upload.  I
checked the last time it happened and the session looks like it was loaded
correctly from a stored session based on params that came in three or four
minutes previous to the call.

Has anyone else had this problem?  What''s the best way to troubleshoot
something like this?

http://apps.facebook.com/supertagphotos

-Aaron