Batch Rename Won't Work

Hello,

I am using Adobe Bridge CC 2015 version 6.3.1.186 and I am trying to do a batch rename on a lot of photos (all are JPGs). It was working, then when I opened a new folder of photos, it stopped renaming them. Once I click rename, nothing happens to the original filename. I tried to purge the cache, force quit and restart my computer, but nothing has happened.

Does anyone have any suggestions on how to fix this?

Thanks.