404 on logo upload

Using Point 1.0.6 on 3.9.1, I get a 404 error when I try to insert an image for the logo. Actually, the upload/selection happens fine. It’s when I click “insert into post” that I get the 404.

Any ideas what could be going on? I use the iThemes Security plugin, so I didn’t know if maybe one of those settings could be blocking it. I can select regular images and set Featured images without a problem though.

Can I hack in the image URL directly into a theme file as a workaround?