Hi Pertti,
Thank you for the log file.
The SmugMug API returned the error, “Not Found”, yet the Private node clearly exists. I found nothing wrong with the request that Photo Mechanic made to the API. This suggests to me that Photo Mechanic doesn’t have the permissions it needs to access the folder.
I recommend that you check your SmugMug account settings, using your favorite Web Browser, and make certain that Photo Mechanic has Full access to your account. That setting can be found in:
Account Settings -> Privacy -> Authorized Services. The Photo Mechanic 6 service needs to have Full access with Modify permissions.
You can delete the PMDebug.txt, PM.log and PM_log.zip files now.
HTH,
Jerry