Hi Markus Berchtold,
By defult users with Roles=Autors dont have set rights to Modify/Delete Pages (see attached file). Author can create and view Pages but cannot but cannot modify or edit pages, created by other users. Thats why they are not allowed to set Page as Homepage.
To grant permissions to Authors:
1. Go to Pages
page, click Permissions for all pages
link in the right side of the page.
2. The Permissions for all pages
3. To change the permissions for an action, click Change
4. A window appears - select the Selected roles or users
5. Click Add roles or users
button - a window appears.
6. To add a role or user, click Roles
tab - select Authors from the list and click Done selecting
The roles and users that you have selected, appear below the Selected roles or users
All the best,
the Telerik team
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