Previews of Jpegs exported from iPhoto are not loading.

JPEGS exported from iPhoto are not loading in Bridge. Some load but most just hang either with the white jpeg icon or with a black border around it. See attachment for reference. If I click and select the photo, then move off of it, it will load the preview. Have never had this issue with other files or jpegs but just started exporting from iPhoto workflow and running into this issue.