Hi Brian - I have now upgraded my iMac and MBP to latest release. The catalogued folders on the Mac have disappeared, but the MBP is as it should be. Since both PBCs are located on their respective internal drives (due to earlier unresolved problems attempting to use ext ssds) and the Cat Folders content was identical - I wondered what would happen if I copied PBC from MBP to Mac. I think, I may regret writing this last sentence! But I really don't understand why the different acceptance of the upgrade. Tony
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