Samba share - I can write but cannot read

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http://askubuntu.com – I have installed Zentyal with File sharing (Samba). I have created groups to which I have assigned users and file shares. I can successfully write files to the shares with the assigned users, but strangely I cannot read them back (I can even delete them). E.g, I copy theme_innocompany.tar.gz from my desktop to the share, it works fine, all users can see the file has been copied there. Now when any user (including me, who just copied the file there) tries to copy from the share, it fails with the error permission denied. Here's what I have in syslog for the copy: Oct 11 12:36:48 activefs s (HowTos)