I rode for a little while longer then I should have with my old chain, so I replaced the old chain and cassette. But now when I ride in the big ring, the drivetrain makes a horrible sound and the chain falls from the big ring to the small ring. The teeth on the chainring are looking a bit shark-tooth like.
I don't know if this is related but I am using this new ceramic chain-lube.
I don't know if I have to re-adjust the derailleur as it seems to shift up and down properly.