For those struggling to get Player 2 to work -- you have to enter it in the upper portion in the Player 2 _column_, and Player 1 column must be completely blank.  I had to delete the W2G, save and close the return, then add a new form to get it to work. 

That said -- there are enough people experiencing this problem (with a costly piece of software) that Intuit should get it fixed, rather than rely on users to find a work-around (much less turning OFF error-checking).