Yes, clustered environments are affected by this situation. We usually recommend for clustered environments that a single instance is defined as the "master" and recommend the majority of administration takes place from this instance to minimize impact. However, the caching only affects changes made to existing user accounts. There is no delay or caching involved when adding a new account. As soon as a new account is added, it's available to all Serv-U instances using the same DB.
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