Does the attached (using the Superstore Sales data) meet your needs? It uses three different table calculations - two to calculate the measures, and a third to filter only for the most recent quarter across all data. The Compute Using for the latter is an advanced Compute Using addressing on Order Date and State, one effect is that states with no orders in the last quarter or two such as Delaware are excluded. If you want to show all states/countries no matter what, you will need to pad your data.
I'm getting errors on the file you've sent me:
"The table calculation for Orders (Last 2Q!) requires a field that is missing. Please add the missing field to the view."
Am I doing something horribly wrong?
What version of Tableau are you using? There were have been a couple of cases of strange behaviors with table calcs in the 7.0.x series of releases. That's just to gather some information.
As far as fixing the problem, I'd suggest duplicating the worksheet, then removing the offending table calc from the view, then dragging it back in and setting the Compute Using to Order Date. If that doesn't work, let me know and we'll try a different route.