Hi smartmbbs,
We checked your site. However, we did not get the same problem as you mentioned. The Price Filter and Checkout page are still working well(you can see the link images below)
Price Filter is not working
http://www.awesomescreenshot.com/image/1527620/6eb5e517bc65060df0e293ae470a060d
Checkout page
http://www.awesomescreenshot.com/image/1527612/6caaa0d1b1aea7c2cefbb8157c23037f
NOTE: Please DO NOT post much ticket. It's made hard for us to manage all of the queries within this forum, hope you understand us. For easier way, you can list all your questions in a document file and attach it there, we will answer you as soon as possible.
We will close all the other ticket (http://support.ovicsoft.com/topic/show-topic/22374 and http://support.ovicsoft.com/topic/show-topic/22367) and reply you follow this ticket.
Many thanks.