Hi
On sandbox, I get this error trying to create a new item:
Error
You are not allowed to access this page. You can only use your personal components.
I don't get this on my own installation. It's just a plain table. Attached screenshot of the table that is creating the error.
Btw: Can't use png or jpg for attachments...
See the table here:
www.dropbox.com/s/mw704rdeborpyvp/error.jpg