Not sure why your font is showing up wonky on your machine. Your workbook font looks fine on mine. See Below. You can always right click on worksheet and clear. Try a different font. For opening a case try using the webform - Support Case | Tableau Software . I just tested it and it worked for me.
Hi Chuck - thanks for your response. Clearly my machine is wonky with the fonts. It took about an hour before the support case website actually worked for me. It was just a a blank screen - SO FRUSTRATING! I'll keep testing it while I wait for their response.