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 when due and payable or within three Business Days thereafter, 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 2.12 hereof shall not be paid in full when due and payable.