Version 0.4.6 fixes an urgent compatibility issue with WooCommerce 2.6. This release is small but it contains a few other important fixes, including a fix for the reports bug affecting some users. It is recommended for all users, even if you have not upgraded to WooCommerce 2.6.
WooCommerce POS Pro users should manually update the Pro plugin by logging into https://wcpos.com/my-account.