Storage isn't full. Now I'm stuck just walking around with a backpack because of the trade item I'm carrying (Copper Ore Crate). It's been like this all day since the update.

Am I the only one having this problem? ?

This is the first I have seen of the issue unfortunately. I suggest submitting a ticket so customer service can look into your account personally. I'll also forward the info to the devs. Thanks for letting us know  

Here is the web address to submit a ticket:

www.console.playblackdesert.com/support

CM Valtarra

I did submit one. GM Keplan said:

We would like to inform that we are already aware of the issue where users are unable to store any items in their inventory if their character is carrying a Backpack Item(Trade Items). Rest assured that we are already doing our best to resolve this and improve our service to the fullest. Your patience and understanding are greatly appreciated. Thank you.

Was your character carrying a backpack?

CM Valtarra