[Ken Case]

Hmm. It looks like your WebDAV server is redirecting requests from "/webdav/OmniFocus.ofocus" to "/webdav/OmniFocus.ofocus/" (with the trailing slash), and apparently the desktop is handling that properly while the phone is not. I'm not sure why that would be.

We'll try to figure that out, but in the meantime…

If there's some way to convince your web server to serve PROPFIND requests without redirecting them to include a trailing slash, that might work around the issue (and would make all your syncs go a little faster).