AR Invoice in "Proof Stage" in Billing History but not in Bill Stage Proof Tab listing

Hi.  It seems I have generated an AR Invoice, sent it to client electronically, but it is not showing up in my AR transactions for me to apply the payment to it.  When I look at Bill History within the Billing Assistant, I see my invoice showing up with a status of "Proof".  When I go to the Approve/Clear screen it isn't showing up under proof tab because I already sent it. Also, all the time that was on the invoice still shows up as available to bill.  Any ideas?  Thank you.