Hi Bernard,
looking at your pictures would suggest that the material used to make the chain is too thick, can you confirm if it is the same material thickness as your old chain or is the chain in your picture the original chain?
The sprocket teeth look ok. It is also worth checking your clicks, make sure the teeth are in good condition and the retaining spring is doing its job. Check the rims of the sprocket wheels as if these are bent then that could help to throw the chain. Try swapping the wheel that slips with another (if they are identical) and see if the same wheel still slips.
Let us know how it goes 
Regards,
Paul
