Problems in the management of the product price

[inferenza]

Environment: Joomla 1.7 - Virtuemart 2.0 - Template YOOTheme "Downtown" (last version for  Joomla 1.7).

I set the price of the product without VAT in the product catalog, I set the VAT of 21 (+%) in the Taxes Management & Calculation Rules, the price is Displayed in the cart correctly, but there are visible discrepancies.
I do not know if it only happens to me? But the counts are wrong. Why the price is Base Price puls VAT ?
Perhaps we need the prices inclusive of VAT and set 21 (-%) in Taxes & Calculation Rules to have the right view ?

The buttons (Modify Invoice Information), (Add Address), the links (modify payment) and (expedition) don't run ? I receive the error Connection timeout.
Can anyone help me

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