Checkout Page Problem

Hi
I have a Online selling website and i use Woocommerce plugin (2.5.5) and WordPress (4.5). Currently i have a problem with my checkout page. When customer is in checkout progress, after completing requested options and reaching to payment method page, the page appears and continues loading but doesn’t let customer to select one of the payment methods! ( payment methods are gray out ). I didn’t have such problem before. I use Room09 theme, First i thought that my theme or one of the plugins caused such problem but after switching to basic wordpress theme and disabling all plugins ( except woocommerce ), problem still exists! I think WordPress or woocommerce plugin new update make such a problem. Any help will be appreciated