From Eudae on Steam (I have the same problem) :  "Crafting multiple items while inventory is full stalled my game.  Steps to reproduce: 1)Run around the island for 2 minutes spamming RMB until your inventory is full 2)Attempt to craft 200 grass ropes using the craft multiple menu (CTRL + RMB) 3)Crash On a very high spec computer".   And for me, my computer blocked when I craft even 10 things in the crafting menu.