Previous you could use the keyboard to fully control the game by pressing enter to use a tree more than once for example. Now you can do it once but the focus goes off the screen so you cannot use the keyboard again, just can once.
Steps to replicate (I use Chrome btw):
1) Click enter to harvest
2) Harvests tree
3) Attempt to use keyboard again
4) Keyboard does not work on screen
5) Press mouse on screen
6) Keyboard works