There is an inventory / item glitch that prevents me from equipping items or activating blueprints. So far it happened to me twice and it always seems to be caused by a blueprint. I have to quit the game and relaunch it to fix it - but the moment I click the blueprint again, it happens again.
The blueprint in the screenshot is an example. It remains in my inventory even after learning it and whenever I click it again, the game glitches and I can't equip or unequip any items. I can't even drag and drop them within my inventory, basically they become completely inactive and non-interactable until I relog - and if I click the blueprint again, the issue is back.