No longer receiving U_password - what is u_hash?

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We have been consuming MLS passwords for 7 years. In 2015, we converted to RETS consumption for resource U_Password. As of a few days ago (a week or two at most?), this resource is no longer returned. We are:

login_url: 'https://maxebrdi-rets.paragonrels.com/rets/fnisrets.aspx/MAXEBRDI/login' username: '159523129' password: 'obfuscated-for-this-message' user_agent: 'CCARr2m' user_agent_password: 'obfuscated-for-this-message' query: '((U_user_is_active=1),(AO_board_id=|1,2,3,4,5,6,7))'

We get data, just no password. The resource is no longer even visible in the RETS admin resource setup under Agents. We are now seeing u_hash... has the process changed? This is severely impacting over 4000 members, including preventing them from paying their MLS fees.

Thanks, Michael