bug#18937: chmod ???? bug?

[Plato]

Hello,

After using chmod
        chmod -R 644 /media/plato/mountedpartition/     (I see I forgot the * 
at the end)
my
        ls -l
listing has all entry's like these:
        First a list like this of every file and folder
                ls: cannot access /media/plato/mountedpartition/justafiile.txt: 
Permission denied
        Then one time
                total 0
        Folowed by
                -????????? ? ? ? ?            ? justafile.txt
                d????????? ? ? ? ?            ? Files
        One example of a file and one of a directory

If I do
        ls Files
I get
        ls: cannot access /media/plato/mountedpartition/Files: Permission denied
When I do
        sudo ls Files
I get a listing of the contents of files as expected.

Is this a bug?
It was not my intention to get this. I do not know how to get it back to what 
it was.
I tried it on a single file with
        chmod 644 justafile.txt
but that did not solve it. Any ideas?

Thanks for maintaining chmod
-- 
With kind regards,

Plato