Steps to reproduce:
1. Install clean eZ Platform 3.1.0/3.0.5.
2. Modify editor user role (https://ezplatform310.localhost/admin/role/3):
- Remove "Content / All functions" limitation
- Add "Content / Read, Content Type: Folder" limitation
- Add "Content / Create, Content Type: Folder" limitation
3. Create a test editor user.
4. Login into admin using test editor user credentials.
5. Open "Content Structure" page (https://ezplatform310.localhost/admin/view/content/1/full/1/2).
6. Click "Browse" button in the left menu (div.ez-sticky-container).
UDW is opened
So UDF has serious issues for the users with "Content Type" limitation on "Content / Create" policy. And it is reproducible in OE as well.