We had the exact same problem and solved it by running the following query as an administrator:

GRANT ALL ON sys.tables TO custom_user.

On Tue, Sep 1, 2015 at 4:37 PM, Roberto Cornacchia <roberto.cornacchia@gmail.com> wrote:
This seem to happen only on one specific database (which is likely to have been created with Oct2014).
I cannot reproduce it on other databases. So let's just hope it was due to some db corruption.

Should it happen again I'll follow up.

Roberto

On 31 August 2015 at 17:17, Niels Nes <Niels.Nes@cwi.nl> wrote:
On Mon, Aug 31, 2015 at 05:15:21PM +0200, Roberto Cornacchia wrote:
> Hi there,
>
> Is it a Jul2015 feature that access to sys.tables is denied to custom a
> user/schema?
>
> However, sys._tables is accessible. That sounds strange.
indeed, seems some bug.

Niels
>
> Roberto

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