Sorry @iceman,
Being a kind of nerdy guy, I don’t understand what “without success” means 
(not enough tech info)
You mean when you run the rake command, you get a rails error?
If so, please post the full rails error.
Or, does the rails task execute OK? If so, how many posts were rebaked according to the rake task?
Thanks.
For example, my little (very slow 100 sec delay) sample rebake task (running, for this topic) as been running for hours:
Currently 209 of 762 total…
What are your rebake task numbers?