The up arrow (to go back to a previous field) no longer works on initial purchase order & sales order once the cursor is sitting at the price field.  You must enter through the complete line, then go back to the line.  The second time through it works.

Also, at least on SO, if you try to go back to the description line it skips over it and goes all the way back to the beginning, wiping out the line. Again, only on the first time through.