I created a sparsebundle with my admin user.
Mounted it, added files to it, worked a bit, etc...
Created another user.
Booted as the other user, and couldn't write to the sparsebundle, then I went back to admin... and can't write there either. No matter what I do it mounts as read-only. Despite the fact until I created the other user it was write-able normally.
How I force it to be write-able?