Bridge won't update thumbnail previews

I just came across your question. Perhaps it is still relevant, even so much later?!

Had the same problem, albeit in Bridge CS5 (Bridge 4.0) on a Mac: Thumbnails not updating after edit. I tried all the suggested solutions (ie. cache purge etc.), none worked.

This is what finally worked for me: There are two (seemingly nondescript) small square, grey boxes in the top bar of the Bridge window (not the top ‘menu’) towards the right. When you hover over the box on the right it shows “Options for thumbnail quality and preview generation”. Click on that box and three options appear: 1.Prefer embedded, 2.High quality on demand, 3. Always high quality. Make sure that “Always high quality” is selected (in my case “Prefer embedded” was selected, which stopped the thumbnails from updating). This sorted my problem. Perhaps this still also works in your much newer version of Bridge.

In any case, I hope this helps or that you have already solved your issue.

Best if luck.

DefiningImagery, you probably figured this out already since I'm reviving an old thread, but wanted to post this in case other land here on a search for this same problem, like I did. I fixed the same problem (Bridge 10.1) by clearing the cache for the offending folder. 

Hi DefiningImagery,

I'm very sorry if I offended you. If what you have works for you, great. I just said what I said becuase of the hundreds of professional and hobby photographers I know, your workflow is unique. It is your time, enjoy.

Hi DefiningImagery,

Um, where did you get that workflow? That's not helping you. 

First off, assuming that your updates are, well, updated, there is essentially no difference between the capabilities between LR and ACR. That said, the difference between LR and ACR is that LR is ACR with a database (and a number of other features but that's besides the issue here).

When you make a change in an image in LR, the chages are saved in the database (aka catalog). You can implant that data into the image but there's not much reason to. When you open an image in Bridge and make any changes, if you were to relook at those images in LR you'll get a warning letting you know there's a conflict between what LR knows about that image and that something has been done to that image outside of LR (in this case it's what you did in ACR), which corrections do you wish to use?

I think you should think this is a great thing that Bridge 9 is not showing you the thumbnails becuase it gives you an opportunity to re-examine your workflow. Please try this: look at the images in LR. If you need to do something to them in PS, simple press Command/Control-e, (LR will ask if you want to work with the original image or with a copy of the image, or with the changes that LR has already done to the image — that's the one I always use myself) and the images will show up in PS, you can do your corrections, close the image and save the changes and then when you go back to LR, you will have the last version of the image you did in LR (so it's still there, nothing has been deleted) and the new PSed version of the image ready for you to do what you want with it.

In other words, what I'm trying to say here is that you are giving yourself an amazing extra amount of work for no benefit and a lot of loss of time and functionality. I'm not against Bridge, I use it almost every day but the way you are intermingling Bridge, ACR, and LR is not helping you.

I hope this makes sense.