Tax is not showing

Hi all, I have upgraded from 1.5.1.1 to 1.5.1.3.
After upgrade my prices in the store, dosent show up with tax anymore.
I have the price including tax and the price ex tax to be the same.

Can anyone tell me what to do, to make it work again?

I have all the right settins for the zones, and geozones, and in the settings page, I have the "show prices with tax" enabled.

When I log in with a user, the same thing happens.
Is there anything else I should be aware of?

Hope that you can help me....Non of my prices is correct anymore.

Is it a bug in the new upgrade??

Hope to hear from you, very soon.

Best regards,
Mobimob

...im having the same issue.

Me too! Several hours on this, and can't figure out what is wrong: tax classes (with rules), tax rates, Geo-zones.
No tax, either with product price or at the end of checkout.
Help!

uhm, now I have the tax appearing back with the product price. I am not sure what I've changed, but I think it was something to do with "Priority". But, unfortunately, I am not sure what happened...
Calculations fine.

I have the same problem. I cannot see what to change.
Both price and ExTax show the same value.
Has anyone found a solution ?
EDIT :
FOUND THE SOLUTION on this thread : http://forum.opencart.com/viewtopic.php?f=19&t=42365
with thanks to poster Lao
Needed to setup a Rule in Tax Classes