I spent a lot of time trying all of the suggestions above, but nothing worked.įinally I just turned the computer off and started it up again. Then select the option to "Show icon preview" and close the options window. This hasn't caused any issues I can detect on my Mac Pro To change that right click on one of those files and select the Get Info, in that window select the Application to use to open, and then select apply to all Change All. This will create an empty file owned by root that DropBox can't overwrite since DropBox is running as your user when you log in. Then wait seconds, and open a folder where previews weren't working. You may need to relaunch Finder with this method too. To do this, right-click on one of them and choose Get Info. What's the problem here? If this doesn't work, ensure that JPG files are associated with Preview. Most of the instructions I've found online this, for example say all I have to do is select "show icon preview" in the finder view settings. Ask Different is a question and answer site for power users of Apple hardware and software. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.