I have also been experiencing similar issues after upgrading to 10.5. My team is unable to open map documents that were made using 10.3. I am currently trying to open one of the business analyst templates that automatically get downloaded to my desktop to run a demo report and it has been loading for 10 minutes now. Please let me know if you find any solution. I am in the queue with Esri but an analyst hasn't' contacted me yet. Thank you.
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