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Can you post an example packaged workbook (.twbx)?
I have never seen a data refresh wipe out the structure of a view. Things I have seen, and other possibilities I can think of:
- The data in the Excel sheet has changed such that there is no data to show in the view. There would still be pills on the various shelves, but the view is blank. In this case, check the filters and the data.
- The structure of the Excel sheet has changed such that the fields no longer associate properly. For example, if a blank row was inserted above the column labels, or columns were renamed. Tableau can no longer find the fields that it expects to see. In this case, the pills would be red, and the fields would be displayed with the red exclamation point indicating an error. Rebuilding the data source connector would be necessary.
- A corrupted workbook file (.twb) or Excel file.
If these don't help, I suggest opening as case with Tableau Support.