Not working with Entity Translation enabled

I have installed this module, created test node types and pay-to-publish products asociated with these node types. Everything worked perfectly, until I installed Entity Translation module and allowed translations for pay-to-publish product types.
When I translated pay-to-publish type products into other languages, the Node Checkout module stopped working. After submitting new node I got redirected to the frontpage instead of shopping cart. New node was created but shopping cart stays empty, no product was put in. I receive this message:

Add some items to your cart and then try checking out.

When I revert back the translation into the language neutral state, everything works fine again. But in language neutral state only.

Any help would be appreciated very much...