mta11 on "[Plugin: WooCommerce - excelling eCommerce] Wrong tax calculation"

After installation of WooCommerce 2.0.5 I experience a problem with taxes. In the settings I choose for prices entered including tax and display prices including tax. The result is that WooCommerce 'assumes' that prices are entered without taxes, so the totals after checkout have 'double' taxes.
Any help appreciated very much!

http://wordpress.org/extend/plugins/woocommerce/