If (a) the interest on any Loan, any commitment or other fee, or any other Obligation not listed in subpart (b) hereof, shall not be paid in full within three Business Days after they have become due and payable, or (b) the principal of any Loan, any reimbursement obligation under any Letter of Credit that has been drawn, or any amount owing pursuant to Section 2.13(a), (b) or (c) hereof shall not be paid in full when due and payable.