Strangely enough, I can't combine items in the inventory. I left-click an inventory item and that makes it my cursor, but left-clicking another item in the inventory just updates the cursor again. I've tried right-clicking, but that just either examines the item or sets my cursor back to the standard arrow. Also, I can't figure out how to share inventory items between Daniel and Lin.
Running Windows 7, game in full screen, standard track pad.
Really beautiful game, I can't wait to play the rest of it.