Is there any errors while publishing? How are you publishing the worksheet/workbook, what options do you have selected? Verify Permissions, Data Sources and any other options.
There are no errors while publishing. I should have added - this was originally noticed because this histogram was just one part of a dashboard. All other sheets, charts, titles, etc. publish fine on the dashboard. It is just this specific sheet. I simplified the chart as much as possible after identifying that the issue was with the combined fields.
I am publishing using all default options using [Server] -> [Publish Workbook]. The data is an extract from Teradata. There is another worksheet on the dashboard connected to the same data source that displays fine. I'm not sure where to find the other options you're mentioning?
As an aside - one thing I have tried is concatenating the fields in the custom sql query for the data source (rather than using the combined field function within Tableau). This worked to publish but now I cannot use Site and Item individually for action filters from this worksheet for other sheets on the dashboard. When I add Site and Item they are added as ATTR and it looks like I cannot use attributes to filter other sheets? I understand this is a different issue entirely... just trying to find an overall solution.
Thanks for your help,