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Well, seeing that you have aggregated a measure within your calculation with 'running_sum(sum([Measure]))' you will have to aggregate the 'datename' components of the calculation by adding 'ATTR()' to your date dimension. See below:
IF Datename('month',ATTR([Date])) = 'March'
Though, it may be easier for us to help if you were to include a sample by attaching a packaged workbook, even if it's just sample data.
Let me know if adding the ATTR() to you calculation made a difference. If so, we'll work on trying to help you through the rest of your request.
This has helped. However what I had to do was in my sql server, I had to create a table where all the values are aggregated by month.