Hello, 

I'm having the same issue as the other person ~ I can't add new inventory items either.  Like the other user, I also noticed that the Sales Tax editing area was suddenly missing from the inventory Add screen, but in my case that was a blessing because our sales are non-taxable anyway...  but the fact that the missing Sales Tax area coincided with my sudden inability to add new products made me think those two things were related.  When I enter all of the product information and click "Save and Close", that button is unresponsive ~ nothing happens, so I have to just close out of that screen without being able to add my product.  I really need to be able to add new products, so please advise ~ I've already tried clearing my cache, and in fact I've tried this on two different computers with the exact same results.  And we've been adding new inventory products almost every day with no issues whatsoever until very recently.  Today was the first time I had a problem.  Fast help would be very much appreciated.  Thanks!!