What's stopping the graph from updating, is it a filter or something else ?
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Are you using Tableau Server, If Yes then it depends on the setting of the server wither you have setup the option of Refresh Less Often
In above case setting When ever user interact with dashboard it always try to find the data from Cache server first if available. In your case it is happening never the less you can use below Yellow highlighted button to get latest data.
As far as I know, I did not apply any filter. I just clicked on the line chart after dragging the dimensions into the columns and rows.
I'm currently using Tableau Desktop version 10.2. I can't find the option to refresh it or the cache server.