On one of my sites, I can't remove an image or swap it out after I've uploaded it via the CP. I have another site where its working fine. They are both running v1.8.4. Sounds like a permissions issue to me, but I checked those, and if that was the case, why would I then be able to upload images initially?

This issue shows up in the grid > file field-type, as well as the regular file field-type. However, my text can be changed just fine. I don't know where to look. Thanks for any ideas.