Changing authentication to OAuth does not work

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What steps will reproduce the problem?
1. Follow the readme instructions to setup a sample  
2. Change the authentication to OAuth
3. Try to use the sample on appengine

What is the expected output? What do you see instead?
If you use AuthSub, the sample works. If you change the authentication 
subsystem to OAuth instead you can't authorize the access. The sample always 
brings you back to "Authorize with Google" link. If you run the sample using 
the devel/debug option in eclipse, it works ok. It does not work on appengine 
after deployment.

What version of the product are you using? On what operating system?
Version 1.3.5 of appengine-sdk, gdata v 1.41.5, eclipse helios.
Linux - Ubuntu 10.04

Please provide any additional information below.
The AuthSub subsystem always works ok. The problem is with OAuth subsystem. 
It's always repeating the step 7 and failing on step 8.

Original issue reported on code.google.com by aureliom...@gmail.com on 24 Aug 2010 at 5:11