Hi Amanda,
If there was a client copy for the current client for ECC or CRM (or both), you need to finish the steps (such as BDLS etc.) as suggested in following note:
757093 - FAQ: Analyzing CRM Client Copy problems
Also, the logical system needs to be the same for ECC CRMPRLS table and CRM CRMMLSGUID table.If logical system error sysfail happens the queues, you can follow note 588701 to run report to resolve it (as you already did).
Best Regards,
Ellen