Dashboard not working in production

Is there a reason that a dashboard (containing a form and a grid) which work fine in development just gives me a blank tab in production? Version is 9.8.0012 running on Windows.

check response, may be error 500 in your code, something different in the environment (database, etc.)

Thanks for your response. I thought I had checked everything for hours, but found this one obscure difference in a table and that did it.