Thanks for the details, Mark. We've received some issues reported on DUD with DNN 5.4. As a first step, can you please run this in Host / SQL and see if it makes a difference for you:
execute AddSchedule 'DataSprings.DNN.Modules.DynamicUserDirectory.DUDSchedulerClient, DataSprings.DNN.Modules.DynamicUserDirectory',60,'m',30,'m',25,'',1,1,'', NULL,0, 'Dynamic User Directory'
It should, at the very least, eliminate any issues that may be related to the scheduler. Please let me know what happens after this. Thanks!
Candace