Return of Reckoning

im cant use any shop with any char in the game is a bug or only a game error ?

I get this issue where I can't talk to shop NPCs as well. Try reloading your UI because that usually fixes it for me. If you are not sure how to do that then type this in your chat and press enter.
/reloadui

Same issue for me : bug with language. You have to play the game in english, and you can access to the vendors invetory (change language via launcher).