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Yesterday I created a set of 30 categories, and assigned hundreds of images
to them.

Today, my categories are all gone, and the empty default set is back.

What's going on?

Using ACDSee 5.0.

Thanks!

Well, I solved my own problem.

In case anyone else runs into this, it was caused by changing the folder
where the ACDSee image database is located, and not re-launching the app
afterwards. I recovered by copying the database files (and associated
sub-folder) from the old location to the new one. Phew!