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[brajaq]

You might try : tools/options/reset to defaults button (bottom left).

[brajaq]

I had understood.

[brajaq]

The delete function also works in develop mode (though there is a warning).

[brajaq]

Deleted pictures go to recycle bin and may be restored from there.

[brajaq]

I think that default pictures in manage mode (before development) are the jpg extracted from dng (or raw) files. This can be changed in options.

[brajaq]

A complete index of all videos with ACDSee version and subject of video would be helpful !