Check the value of the cookie. If it contains more than one cookie at
a time, then
  sessionId = session_value.split(";");
may not return the cookie value.

See Issue 3379
http://code.google.com/p/googleappengine/issues/detail?id=3379

If you think this is the problem (it was for me) then star it by
clicking on the star image on the left next to the issue title.

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