Inventory items cannot be used.

[Bio-Mech]

What's Happening

You've selected a bomb or other item from your inventory. You've checked and you don't have a quantity of zero of that item. Pressing the "use item" key does nothing.

Known Reasons

You've assigned SHIFT, CTRL or ALT from the right side of the keyboard.

The keyboard's right side modifier keys do not work in the game.

Solution:

There is no known work around at this time.