It seems the credits are gone. All my open orders with credits were cancelled and I no longer have credits in the account.
Yup, mine too. They've expired. We were supposed to use them all by 22nd October.
Perhaps Bittrex has a change of plans on those credits but its weird that they did not make any announcement about the sudden change of plans or offer any explanations to those who lost their credit. This kind of move of exchanges like Bittrex is the reason why they move or take their business elsewhere. Its like they dont value their client because if they do, they will inform any type of changes in the site to all their clients.