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Agreed, I get the warning on a completely empty catalog! So it is a strange bug, but as you say it can be disregarded. I would presume just a Mac problem given the learn more link?
However is it just a warning rather than a bug?
Same issue on OSX 10.12.1 and LR CC 2015.8
Just click and ignore
Well, it's a "bug" in that it should not be showing this warning. I too am experiencing this, however in the following support article ( Extracting compressed Lightroom catalog backups larger than 4 GB on Mac ) it actually says:
Catalog compression in Lightroom CC 2015.8/Lightroom 6.8
Beginning with this release, Lightroom compresses all the catalogs when creating a back up — including the ones that are larger than 4 GB.
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Thanks guys. I've already reported it, but too late to get the fix into 6.8. It is just cosmetic, so click Don't Show Again to stop it showing up.
Thanks to all of you for your replies. I feel much better!