I have installed Owebia-Shipping-2 in my client website. But after installing this extension my checkout process crashed. After filling billing information page redirect to cart. if i disable this extension then the checkout process working perfect. Please give me solution how can i use this. its very important for me.
Website link is: http://artofbrands.com/
Have you check console, system.log and exception.log file for error log? You need to fix the error logged in these files. Also check if the extension rewrites any code for the checkout & check if it's working as it should or not.
Let me know if this doesn't help.