WAD Can't rename files in subfolders

Aug 28, 2008
93
3
#1
I download various images from Tumblr, and when I do they often get saved with the extension ".jpg-large". I can find these files in a particular folder hierarchy with a simple command:

ffind /s *.jpg-large
That command finds many files with that file extension. The problem occurs when I run the following command:

ren /e /s *.jpg-large *.jpg
That tells me "0 files renamed", seemingly not finding any of them. I know this used to work because I've been doing it every now and then for years, so is there an issue with renaming files in subfolders these days? Thanks in advance!