Power View returns incorrect totals on SSAS MD

I have a very simple Power View report on top of SSAS MD.
I have two measures - both not calculated: an average over time and a last-non-empty.
When I slice the data, the totals are incorrect. For example, if I look at two months - June and July - the average returns a result as if the sum was divided by 1.97 instead of 2 and the last-non-empty returns the amount of december, instead of July. When
I reconstruct the same report in SSRS, the totals are correct.
This looks a lot like this bug:
http://support.microsoft.com/kb/2880094/en-us
The solution in the KB article is to install SQL Server 2012 SP1 CU6, however I already have CU9 installed.
Maybe the patch wasn't succesful? Is there any place I can check? When I run the set-up again I get the notification there is nothing to update.
Any ideas?
MCSE SQL Server 2012 - Please mark posts as answered where appropriate.

Maybe the patch wasn't succesful? Is there any place I can check?
Hello，
You can check the version of SSAS in the Windows Registry. Or you can connect to the server by using Object Explorer in SQL Server Management Studio. After Object Explorer is connected, it will show the version information in parentheses.
Reference:
Find the SQL Server Analysis Services and Reporting Services Version, Edition and Service Pack
Microsoft SQL Server 2012 Builds
Regards,
Fanny Liu
If you have any feedback on our support, please click here. 
Fanny Liu
TechNet Community Support

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