Is it now set so that both credit and items are accepted for all trades or is it now just automatically item unless we specify otherwise?

It is now 'Accept Both' by default. We have decided that this option was not very useful and added unnecessary complexity.

I should say that the credit system can be a bit of a gyp. Seeing as how you can only withdraw refined and not scrap or rec, it can really tie up your resources and result in loss of sales.