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When I click the Cloud in LR Classic to sync my Collection to make it public, I get a message that another catalogue is being synchronized. Which is a mistake, as I have only one catalogue. But I did change my PC, that seems to be the origin of this confusion. How to get past this problem?
AFAIK the dialog should give you the option to start the sync anyway, meaning you stop the sync of the old catalog and start the sync of the new one. 
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Qutoe:
But I Did Change My PC.
End Quote:
And that is the Reason. The Synce from LrC only works from One Catalog from One PC. Even Moving the original catalog to a New Computer will cause this to happen as you can only sync from One catalog on One PC. Been like this since Adobe started this option.
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AFAIK the dialog should give you the option to start the sync anyway, meaning you stop the sync of the old catalog and start the sync of the new one.