In the below screen shot1 the sheet layout was having 2 dimensions and 2 measures. When we run it returns the data for all the rows and columns
After removing the dimension2 from the layout the measure2 returning null.
Unable to see the screenshots
have you used hyperlinks to an external server to embed your images? Then make sure this server does allow access to the images to all / anonymous users)
Just guessing, but have you used aggregation functions in your measure2?
Use Aggregation Functions!