Sometimes when saving a photo from ACR as a JPG, Bridge won't show the thumbnail. It seems a random thing for some show and others don't. If I click on the thumbnail it will open in PSCC. Then save as a TIFF and it shows. If I change it back to a JPG, then it shows up. Anyone have any idea why this is happening?
It is a cache problem. If it happens again choose the thumb icon and with right mouse click menu choose 'purge cache for selection' then it will build a new thumb and it shows correctly.
If it happens in one folder choose the folder and in menu tool / cache choose 'purge cache for folder'.
If happening on multiple folders even a purge of central cache is needed either in preferences or on start up holding down option(Mac) or control (Win) key and choose this option from the menu that shows.