I appreciate your response, but it contradicts what is in the attachment:

"On Purchase Transactions (check, credit card charge, Bill), I enter the data on the Expenses tab and I 'job track' it (assign the customer to the detail lines) to note this as a Direct cost.  I also mark it as Billable."

This is exactly what I am trying to do- and have always been able to do- but suddenly the 'billable' checkbox is gone.