Well after looking at this further it appears that the item is actually being added to inventory but not displaying immediately (a refresh problem). For example if you add a new item to Misc, then add that item to inventory it will not be displayed.
Now if you close the inventory view and then reopen it - it is displayed.
Another crazy observation is that if I add a bunch of stuff to my ingredients, then close BeerSmith, then reopen it and play with the inventory they seem to show up fine now.
So the workaround for now is:
- create your new ingredients
- close beersmith
- open it and have fun with your inventory
Again - I'll get to the bottom of this and fix it in an early patch.
Brad