Power Pivot measure not showing in Power View report by ArtForum

I created this measure in my Power Pivot,

:=IF(ISFILTERED(Geo[City]),VALUES(Product[Rank]),BLANK())

I created this measure because I want to display a value (Product[Rank]) only if City has been selected (dragged into a table). This works perfectly when I use it in a Excel (using a Pivot Table), but when I upload my file to SharePoint and try to use my measure, It's not showing, I have re uploaded the file several times and the measure is still missing!

When I upload the file I get no errors, everything works perfectly, is just this one measure that's giving me a headache.