Permission issue

Hi --

I've been trying to implement this customization below, from
https://www.roundup-tracker.org/docs/customizing.html#examples

It works nicely except for one thing - the dropdowns for "Sort on" and
'Group on" on the webpage become empty when I put this into schema.py, and
I can't sort or group when logged in (although anonymous still has the
dropdowns)...It seems like a permission issue, but I can't figure out what
permission controls those dropdowns...any advice would be appreciated!
All users may only view and edit issues, files and messages they create
<https://www.roundup-tracker.org/docs/customizing.html#id126>

Replace the standard “classic” tracker View and Edit Permission assignments
for the “issue”, “file” and “msg” classes with the following:

def checker(klass):
    def check(db, userid, itemid, klass=klass):
        return db.getclass(klass).get(itemid, 'creator') == userid
    return checkfor cl in 'issue', 'file', 'msg':
    p = db.security.addPermission(name='View', klass=cl,
        check=checker(cl))
    db.security.addPermissionToRole('User', p)
    p = db.security.addPermission(name='Edit', klass=cl,
        check=checker(cl))
    db.security.addPermissionToRole('User', p)
    db.security.addPermissionToRole('User', 'Create', cl)

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