Images recently added to my library appear to be broken

I recently deleted some art assets and then loaded new versions of the assets with the same file names.  The new images are listed in "My Library", however, they all show as broken image links.  Did something perhaps get out of sync?  I have the images attached to some characters and they are displaying on those characters just fine, but they do not display properly in the library asset list.

I just realized I have some overlap in some of the new file names being loaded so I need to rename some of them anyway.  Due to that I think I'm just going to delete the newly loaded files, rename them all and load them again.  Hopefully that will fix the problem, in which case I will close this issue.

It would seem it is because the new images are gifs. I did not realize that gifs would not render in the art asset window. This issue can be closed.