facebook/php-sdk — Issue #503: getSignedRequest() doesn't check if access_token is valid
Author: zerkms
Created: 2011-11-28 10:35:02+00:00
State: open

I've described the issue in details here: http://facebook.stackoverflow.com/questions/8294488/how-to-deal-with-expired-access-token

Not sure if it is a bug, but it causes very strange application behaviour, that is really difficult to debug