It might just be my card, although I am still having the problem with a replacement, or my US bank Wells Fargo, but twice now in as many weeks when making a cash withdrawal at a Banco Pichincha ATM the process sounds as if it is dispensing the cash but no cash is dispensed and the requested amount has been debited to my account. Both times the transactions were completed at trusted Banco Pichincha ATMs.
I have disputed the debits and they are currently in a claim status. I am not sure of the resolution but thought i would put a warning out there. I have since used a non-Banco Pichincha ATM without any problem.