SQL 2014 - current SQL Server edition is not supported by MDS

Hi,

we've installed SQL Server 2014 on a Windows 2008 R2 server with a namde instance for the database service.

We also installed MDS 2014 on a different server and configured it with the MDS database on de before mentioned database server.
The configuration gives no error, but when I go to the MDS site, I receive the error in the title.

We installed CU #3 on both servers, but that didn't fix it.
In related articles a possible solution is using a default database instance, but since we can't work with that, that's not really an option for us.

Thanks in advance

Regards
Tony