Access token immediately invalidated
for a few users (maybe not that few, considering the number of related mails I'm receiving) the access token associated with an OAUTH authorization seems to be immediately invalidated. The user is guided through the usual authorization process, he accepts the permissions, he is redirected to the right page which includes the access token, but as soon as my application tries to use the access token to get the user ID, an error is received instead: {"error":{"message":"Error validating access token: Session has expired at unix time 0. The current unix time is 1323939801.","type":"OAuthException"