in Item's menu, it lacks each item's descriptions which should be displayed on bottom of screen.
and when i press "B" button of keyboad (hotkey for Items), menu shows up but it disapears in a msec :(
what's happening on this Item's menu?

It's bugged, I had the same. Don't use it, I finished the game without it.

edit: This is bugged not only on GOG as I have game from Humble Bundle.

hmm...ok
in Merchant, i can read details about treasure items but quest items cant be shown up in there. i wonder what they are mentioned...

thanks anyway :)

What do you mean?

when i go to Merchant in Sanctuary, i can read descriptions about each items at bottom of screen, whereas i can't read them in Items menu.
but unfortunately in Merchant it doesn't show any Quest items in the list of it, hiding them for not to be sold wrongly by players i guess.
i wish if i could read descriptions of Quest items...that's what i mean.