What is wrong with the preview program???

[freeradical]

I'm running Sierra, and Preview version 9.0

I can open a group of files with preview just fine, but when I try to open another group of files, I get this message. If I quit the the Preview program and try again, I can now open the files. This happens repeatedly. What gives?

[mikebw]

Are the files in the same location? This might be one case where repair permissions actually helps.

[rz]

Repair permissions only worked on system files, not JPEGs in your own folder. Check the actual permission of the file(s) in question.

[modelamac]

Try booting in Safe mode then rebooting normally.

[pdq]

I’ve seen that kind of thing when I’ve moved files (in non-Apple-ish ways) from one Mac to another, or maybe when files are copied from an admin account to a non-admin user account.

If you can figure out what files are affected, I think you can go to whatever folder encloses them all, go cmd-I (get info), and change permissions on that folder, checking a box that says apply these changes to all enclosed files.